Making sense of cervical fluid

Cervical fluid, otherwise known as discharge, is a see-through to a white and creamy substance that is secreted by your cervix and comes out through your vagina. Estrogen is the hormone responsible for producing cervical fluid. Throughout your menstrual cycle, the amount and consistency of cervical fluid that is produced will fluctuate. You might have noticed this fluid in your underwear or when you wipe going to the loo. It is completely normal and can indicate what phase of your cycle you are in.

How cervical fluid can change throughout your cycle:

  • After your period

You might experience a rather dry vaginal sensation just after your period, in most cases, no cervical fluid will be present. After a few days, you can develop a cervical fluid that is dry – like dry toothpaste. Shortly after a creamy cervical fluid with a lotion consistency will follow, it’s also known to give you a rather cold vaginal sensation.

  • Your fertile days before ovulation

The most fertile cervical fluid is produced coming up to your ovulation. It is wet, extremely slippery and may even stretch between your fingers for a couple of centimetres. Our body prepares for a possible pregnancy every month, this type of cervical fluid provides a good fertile environment for sperm to survive – it nourishes them and helps them swim.

By using protection such as a condom on red fertile days, you can stop this from happening.

You will notice this as a somewhat symmetrical round pattern on your underwear; this is because it mainly consists of water. This is often known as egg white cervical fluid as it resembles its consistency.

  • Post ovulation

After ovulation, you are no longer fertile and can experience dry, sticky or no cervical fluid again up until your period.

Although cervical fluid is a good fertility indicator, it varies from one person to the next. It can also be difficult to interpret, is influenced by sexual secretion (natural lubricant) and is a subjective measurement.

Natural Cycles takes the main indicator of temperature into account, which is an objective measure. The unique algorithm behind the app also takes many other factors like sperm survival, and your unique temperature fluctuations and cycle irregularities into account. It then calculates whether you are fertile or not. This method is backed by clinical studies and has been proven to be very effective.

You can also take note of your cervical fluid in the ‘Notes’ section in the Natural Cycles app, so you can get to know your own body better because knowing #yourcyclematters.


Weschler, T. (2015). Taking charge of your fertility: the definitive guide to natural birth control, pregnancy


Cycler Story: “Preventing a pregnancy doesn’t have to fall solely on your shoulders, ladies!”

Thousands of women are using Natural Cycles every day, and we love getting to know them and hearing their inspiring cycler story. This time around we have a chat with Claire from Boston; she talks about why the burden of preventing a pregnancy doesn’t have to fall solely on women’s shoulders.

Tell us a little bit about yourself:

I’m a community herbalist living in Boston, working to connect people to plants. I created Plants and Provisions to fuse healthy food and herbs to empower people to take charge of their own health. I hold private wellness sessions and teach workshops on how to incorporate herbs into everyday life. I want people to know that they don’t have to just suffer from their pain or illness. With a little work, there is a road to better health!

I’m lucky because I get to mix work and leisure time. I absolutely adore wandering in the mountains with my pup, wildcrafting plants for the self-care products that I make, and drinking tea on my front porch in a rocking chair.

How long have you been using Natural Cycles for?

I’ve been using NC for about nine months now.  I love it because it is SO easy to use. I used to have a hard time tracking my cycle, and thought that it was really irregular, but now that I’ve looked back over the data, I realize that everything is going as it should, I just have a longer than average cycle.  

I also really appreciate the way the app gathers such detailed information and leaves space, so you to write notes about anything you think is important.  For example, I now know that sugar or caffeine will affect my temperature the next morning.

Would you recommend Natural Cycles to other women out there?

Absolutely! Taking charge of your reproductive health is incredibly important for all women!  I meet with a lot of women who are looking to move away from using hormonal contraceptives but are worried about becoming pregnant before they’re ready. The app is so straightforward; it takes the guesswork out of the process and the paperwork out of manual cycle tracking.  It’s also an easy way for your partner to stay informed, as he can (and should!) simply log in to the app to be aware of where you are in your cycle. The burden of preventing a pregnancy doesn’t have to fall solely on your shoulders, ladies!

A big thank you to Claire for sharing her story with us, you can check out more of our Cycler stories here.

We love hearing back from our lovely Cyclers, everyone is unique and has their story to tell. We want to give women a voice so they can inspire others to get to know their bodies with Natural Cycles too – if you want to be a part of this movement go ahead and share your Natural Cycles story with us.

Looking forward to hearing from you,

Your Natural Cycles team

Thank you for this year!

This past year has been huge here at Natural Cycles! We got to celebrate plenty of successes, so we just wanted to take a moment and a step back, to say thank you.

All of you lovely Cyclers have supported us on this journey and without you – we wouldn’t be here today. Let’s keep striving for a world where #yourcyclematters.

Here are the top highlights of this year:

Natural Cycles became the only certified contraceptive app

Having an effective method of digital contraception impacts women’s lives in a positive way, every single day. Beyond that, it is changing the way we think about contraception on a societal level.

This year the app became the only certified and CE marked medical device of class IIb, intended to be used for contraception in Europe. It was a huge step towards improving women’s health by increasing contraceptive choice.

Read more about our certification here.

Largest prospective study on Natural Cycles was published

It’s our mission to lead the way when it comes to research in women’s health. This year we have published the third and largest prospective study carried out on Natural Cycles together with leading experts in Women’s Health, once again confirming Natural Cycles’ efficacy.

We have plenty of more clinical studies in the pipeline and are excited to see what the next year will bring us with even more team members in the science department.

Read more about the study here.

Natural Cycles landed another investment round

Our latest funding round closed with a $30 million investment in November 2017. This has been a great achievement for us as we are aiming to do more research in reproductive health, will keep improving the Natural Cycles app and lead the way within digital contraception.

Read more about the investment round here.


Wishing you all the best and a happy New Year! Here’s to an even bigger 2018.




Cycler Story: “Having this data-backed understanding of your body, is incredibly powerful.”

Thousands of women are waking up to Natural Cycles every day, and we love hearing their inspiring stories. This time around we had a chat with Karen from London; she tells us her Cycler Story about how it’s a simple way to stay on top of your body.

Tell us a little about yourself:

I work as a portrait and fashion photographer in the daytime, but I play around with modern calligraphy in my downtime. I dream to have my own stationery shop in the near future, but we’ll see. Currently, I’m residing in London, but I was born and raised in New Zealand. I miss home every day, but I try to make the most of my time here in London as well.

How long have you been using Natural Cycles?

I’ve been using Natural Cycles for about 10-11 months; time flies! I just like that you have more education about your own body and you get to learn it’s unique nuances and patterns. For example, cliche, but I do tend to get hyper emotional just before ovulation. My hormones are PEAKED so that I can plan (sometimes!) accordingly and tell myself that I’m acting a little out of character, not because I’m “crazy” but because my body is going through a physical change right now. Once it’s a habit as well, it’s so easy to measure your temperature. Having this data-backed understanding of your body, is incredibly powerful.

Would you recommend it to other women?

I would 100% recommend this to women and have recommended it, to the women in my life. This a simple, easy way to stay on top of your body and prevent pregnancy. To me, it doesn’t make any sense to have it any other way.

I’ve always wanted to keep track of my cycle and fertility, and this was a great way to do it. Rather than writing it out on paper, etc. this is a lot easier to maintain. I like that you can compare the data with other users. I also love how easy it is to correlate the data and access the stored data. Getting a basal thermometer included free of charge in the yearly subscription, was a nice bonus too.


A big thank you to Karen for sharing her story with us; you can check out more of our Cycler stories here.

We love hearing back from our lovely Cyclers, everyone is unique and has their story to tell. We want to give women a voice so they can inspire others to get to know their bodies with Natural Cycles too – if you want to be a part of this movement go ahead and share your Natural Cycles story with us.

Looking forward to hearing from you,

Your Natural Cycles team

Meet the team: Stanley keeps our spending and financial accounts in check. 

Every month we introduce a member of the Natural Cycles team, this time around we had a chat with Stanley who is responsible for all things finance. He keeps our spending and financial accounts in check. 

Where are you from?

I come from the East – China originally and then moved to Michigan, then I came to Sweden about 3 years ago. Apparently, I love being chilled so my next stop might be the Arctic 😀

Tell us about your work at Natural Cycles.

I take care of everything related to money including counting dollars every day and spending it too – that’s the fun part. And of course, I take care of investor reporting, assisting with fundraising, accounting and so on.

Why Natural Cycles?

The company is doing very well for itself, we just landed an investment so that’s exciting 😉 Of course, I work with very lovely people too and enjoy spending time with them – even after work. I like that we work at such a fast pace and we are growing fast.

Your favourite project at Natural Cycles since you started?

Fundraising – by far.

What does it mean to be a good Finance Manager?

Three things; solid ground basics, top-notch communication and strategic thinking.

What’s one thing you’ve learned during your time at Natural Cycles?

Afterwork means a lot 😉

What’s your go-to place to eat in Stockholm?

Faros it’s a Greek place, I like authentic food.

Favourite feature in the Natural Cycles app?

I like that you can share NC with your boyfriend if you want, he can just download it on his phone and take care of his girlfriend.

Favourite song?

‘More than you know’ – Axwell & Ingrosso, I’m also listening to ‘Something just like this’ from Chainsmokers and Coldplay.

Favourite quote?

“We need a roadmap for this”

Tell us about your hobbies?

Everything adventurous including skydiving, desert explorations, arctic sightseeing, bungee jumping and scuba diving.


If you are interested in joining the Natural Cycles Team, want to work on improving women’s health, continue to push the scientific research behind it and truly make an impact within the contraceptive and reproductive market – go ahead and check out our job openings here.

Cycler Story: “Natural Cycles is like taking an X-ray of yourself”

Thousands of women are using Natural Cycles every day and we love getting to know them and hearing their inspiring Cycler Story. This time around we had a chat with Constanza from Chile, she talks about how Natural Cycles goes further than just contraception.

Tell us a little bit about yourself:

My name is Constanza, I am 30 years old am from Chile and work as a veterinary surgeon. Although you might picture me surrounded by cats and dogs, my passion has always been around wildlife conservation. Throughout my life, I have always been in search of opportunities to get experience in that area. Those opportunities have led to me to experience adventures in different parts of the world.

I have volunteered in places like the Ecuadorian Amazon, Kenya, Brazil, and even searched for owls in the amazing redwood forest in northern California. Currently, I am doing my Ph.D. at the University of Cambridge and my research is focused on fur seals, their microbiome, and their genetic background. My project requires me to do fieldwork in a remote location in the middle of the Pacific for some poo hunting… yes, you did read that right, I work with fur seal feces and you know what? I love every single aspect of my work. As a woman coming from a conservative developing country where the female role is still family driven it has been a long way to finally enter the world of science, especially in an area like mine that involves going out to do fieldwork on my own. Being able to do this makes me feel absolutely empowered and capable of doing anything I want, regardless of my gender.

I consider myself to be a very active outdoorsy person who loves challenges, I enjoy pretty much every outdoor sport, hiking, mountaineering, diving, surfing, mountain biking and currently I am super engaged in traditional climbing. Since I was a little girl I have always wanted to do all these “boyish” things and as I grew up knowing that I was seen as a cute little girl, I really got obsessed with making myself look as tough as I could. I would rarely ask for help with anything because I wanted people to see me as a capable strong person. I think at some point I also got the wrong impression that being a girly girl equals weakness. It was not until my mid 20’s that I understood I could be a fearless person without having to act like a man. Now I look for feces, do experiments in the lab, go away for climbing weekends, get a bunch of scratches and bruises, smell like fur seal poo – and still feel feminine.

How long have you been using Natural Cycles for?

I started using Natural Cycles in March 2017. I used the pill for about 10 years. In 2014, I decided to take a break from it and then I didn’t have my period for at least 6 months. That was critical in my decision of never taking the pill again.

In my search for alternatives, I just couldn’t find any method that I would feel comfortable with, until this year, when I decided to try Natural Cycles. To be honest, at the beginning I was a bit skeptical and afraid, I have worked so hard to get my Ph.D. position that I could not risk getting pregnant. But as I started to get to know the app and developed the habit of measuring my temperature every day, I could see why it was so effective.  I love that it is natural, respects and empowers my femininity and I don’t have to adapt to the method, the method adapts to my own individuality. Natural Cycles is more than just a contraceptive method, it is like an x-ray of yourself. I also love the team behind Natural Cycles, on the few occasions where I had a couple of question – I received a very quick and clear explanation. It makes me feel part of a community and that I have an entire team behind me. I don’t feel like just another customer. I also like the newsletters they send out about different common female problems.

Would you recommend Natural Cycles to other women, and why?

Would I recommend Natural Cycles? No doubt about it. We are in an era where feminism has become a trending topic but how many women actually understand what involves being a woman? Our cycles have a direct influence on our daily life and each woman is different. These differences are detected by the algorithm which will adapt to you with every data point you enter. It is basically a custom-made product. On the other hand, I do want to point out that taking your temperature and adding other data as accurate as you can, together with taking care during the red days shown by the app, is the key to the app’s success. So I would not recommend this method to somebody who cannot commit to data recording or that is unable to take extra measures for those highly fertile days.

Big thanks to Constanza for sharing her story with us, you can check out more of our Cycler stories here.

We love hearing back from our lovely Cyclers, everyone is unique and has their story to tell. We want to give women a voice so they can inspire others to get to know their bodies with Natural Cycles too – if you want to be a part of this movement go ahead and share your Natural Cycles story with us.

Looking forward to hearing from you,

Your Natural Cycles team

The most important female hormones you’ve gotta know

Hormones play a very important role not only in your menstrual cycle but in overall health. Sometimes they sound a little difficult to wrap your head around but we’re here to help break it all down. Here is what you really need to know about your female hormones.

You can think about hormones as your body’s communication system. They trigger a lot of important processes such as making you feel hungry or tired. During your menstrual cycle, these hormones rise and fall in a specific pattern causing changes in your body. Some you can see, such as your period, but others you cannot, such as ovulation.

Estrogen: the hormone behind your period

This hormone fluctuates over the course of your cycle. A gradual rise in the level of estrogen in the first two weeks of the menstrual cycle — the follicular phase  — is what causes your uterine lining to build up each month.

You might notice that your sex drive tends to increase in the days leading up to ovulation. Once you have ovulated your estrogen levels drop quite sharply, which might cause you to feel down, but they start to rise again a little until your period comes along.

If no pregnancy occurs, which is most often the case, estrogen (and progesterone) levels will drop again in the second phase of the cycle, causing your uterine lining to be shed i.e. your period and your next cycle to begin.

Luteinizing hormone: makes you ovulate

This is the hormone that causes your egg to be released from the ovary. As with all hormones, LH is present throughout the cycle, yet the surge happens just before ovulation.

This is why Natural Cycles will ask you to test for LH for a couple of days before you are expected to ovulate. It indicates whether your body is getting ready to ovulate or not. A positive result is a great indicator that you are likely about to ovulate, but the app can only confirm if you have ovulated with following high temperatures which are caused by….

Progesterone: causes your temperature rise

Progesterone levels shoot up once an egg was released from your ovaries i.e. ovulation has occurred.

This hormone causes your body to warm up a little. If you take a look at your Natural Cycles graph – you will see that your temperature is higher after you have ovulated. This is the main indicator the algorithm uses to identify your ovulation.

Should a woman become pregnant, the progesterone levels will continue to rise and so will her temperature. Whereas you will see your temperature drop again as progesterone drops once your period arrives.

Progesterone, though essential for reproduction, can bring along annoying symptoms for women during the last two weeks before your period.

These symptoms more commonly known as PMS include bloating, breast tenderness, and acne. It helps to keep track of these symptoms in the app and even things like exercising can help to counteract.


Your female hormones determine what goes on during your menstrual cycle and the changes you experience during the different phases. So getting to know them will explain a few things not only about how your body works but also how tracking your temperature can identify your ovulation and fertile days.

Your Natural Cycles team


Natural Cycles just closed another investment round

We are ecstatic to announce that we have just closed another investment round. This will allow us to reach even more women with Natural Cycles and keep advancing research in women’s reproductive health.

Our third and largest financing round in Natural Cycles history brought in an investment of 30 million dollars and we are absolutely humbled by it. The boost will contribute to bringing Natural Cycles to the next level in the best possible way, so here’s a quick breakdown of how we intend to leverage it:

Bulking up the medical team

For us to scale globally, we will need more people hands-on in all areas of the company. Currently, we are a team of 43 employees and our plan is to grow our international team even more next year. By adding doctors and more physicists from CERN we will bring Natural Cycles to the next level.

Product development

Our product team is working day in and day out on improving things in the app, making it easier and more fun to use. With our new team members, we will continue developing more features and making constant improvements so we can create the best possible Cycler experience.

Educating even more women

It’s our mission to continue to educate women about their bodies and menstrual cycles. It’s time to break the taboo around the topic and start openly talking about it. With Natural Cycles we not only want to give more women an effective method of contraception to choose from but a powerful tool so they can make informed decisions.

Because we truly believe that #yourcyclematters, and so does everyone else’s.

This past year has been huge here at Natural Cycles and full of successes. We have been certified as a contraceptive in Europe, hit pharmacy shelves, published our third and largest prospective clinical study and now this. Without our Cyclers and our great team we wouldn’t be here today – so once again it’s time to drop another thanks and praise to all.

Your Natural Cycles team

Natural Cycles is hitting pharmacy shelves

This week we have reached another milestone here at Natural Cycles – we will be hitting pharmacy shelves for the very first time this month. From now on our lovely purple thermometer, along with a 6-month subscription code will be available for instant purchase at Apoteket, Sweden’s oldest and most renowned pharmacy.

We are very happy to see Natural Cycles in stores, also because Apoteket handpicks their products very carefully, ensuring to only stock their shelves with the highest possible quality. The pharmacy only presents ethical and sustainable companies that are in line with their core values.

This big step allows us to bring Natural Cycles to even more women and we would love to see Natural Cycles represented in pharmacies all over the world one day.

Our offline Natural Cycles version has got everything you need to get started and will also be snuggly packed into our brand new and colourful packaging, created by our very own Design team. We had a quick chat with them to find out what their thoughts were behind the packaging and how they came up with it:

“We wanted to create something unique because that’s what we’re all about. Every woman and every cycle is different and this packaging reflects that. It looks different from every angle and that’s what I like about it.” – Daniel, Head of Design


Let’s keep pushing for Natural Cycles to become available for all women worldwide.


Your Natural Cycles team

Cycler Story: “To learn about your own body in real time is a massive eye-opener.”

Thousands of women are using Natural Cycles every day and we love getting to know them and hearing their inspiring stories. This time around we have a chat with Beccy from Bristol, she talks about how much she loves nerding out on her data and how learning about her body has been an eye-opener.

Tell us a little bit about yourself:

I live in Bristol, England, with my gorgeous husband, my dog, and two cats, and work at the University of Bristol in the Library Services. I love my day job, but my major passion in life is writing. I took an MA in Creative Writing at Cardiff University, and led creative writing workshops in schools. I’ve had a few poems, a paper, and a couple of articles published, but my main focus at the moment is writing my first novel, ‘Goodbye Horses’, a psychological drama about a woman living in self-imposed exile on the Shetland Islands, haunted by a dark secret. You can read some of my work on my website,

How long have you been using Natural Cycles for?

I’ve been using Natural Cycles since April 2017 as a method of contraception. I’m a pretty sceptical person – I need to see scientific evidence for everything! I did a lot of research before I started using it. The fact the app was certified and CE marked was incredibly reassuring and convinced me to give it a try. I’m so glad I did. It’s really easy to use – it only takes a minute or so each morning – and is amazingly accurate. I’m a bit of a data nerd, so I love seeing the variations in my temperature, the length of my phases, and how they compare to the average of other users. The little messages and reminders are great, and really useful; the app tells you the best time in your cycle to do a breast self-examination, for example, which is something I would never have remembered to do before. I feel like my whole adult life has been one long search for the right contraceptive, and I finally feel I’ve hit the jackpot with NC. It has given me so much insight into how my body works. We all learn the ovulatory cycle in school, but it all seems very abstract and a little intimidating, and somehow not applicable to real life. To learn about your own body, so easily, and in real time, is a massive eye-opener. I love feeling in tune with my cycle.

Would you recommend Natural Cycles to other women out there?

I would definitely recommend NC to other women, particularly if they’re struggling with other types of contraception. Read up about the app, research it yourself, give it a try. It’s been fantastic for me. It’s made me feel in control of my body and my fertility for the first time in my life.

A big thanks goes out to Beccy for sharing her story with us! We love hearing back from our lovely Cylers, everyone is unique and has their story to tell. We want to give women a voice so they can inspire others to get to know their bodies with Natural Cycles too – if you want to be a part of this movement go ahead and share your Natural Cycles story with us.

Looking forward to hearing from you, Your Natural Cycles team

Your Natural Cycles team