A scientific study performed among women tracking their cycle in order to conceive, showed that only 13% knew when they ovulate and as many as 55% were missing their fertile window altogether. Note that these are women who are trying to figure out when they ovulate, so if you ask the common population the numbers will be a lot worse. This shows that a mathematical analysis of your cycle greatly improves your chances of conception. But maybe even more important – it shows how crucial this is for ensuring safety of using fertility awareness as birth control. If you don’t know when you ovulate, you cannot know when it’s safe to have unprotected sex! Use www.NaturalCycles.com instead and you don’t need to worry. It analyses your cycles for you and is > 99.5% safe.