We discourage our younger users from trying to use fertility awareness as a sole method of birth control. In order for these methods to even have a chance of working a person must have regular cycles which have been regular for some time - ideally, at least a few years -- as well as the ability to chart and record fertility signals every single day, and a partner who is deeply committed to doing their part to practice the method properly. It's normal for it to take up to five years for fertility and menstrual cycles to regulate, so even for Scarleteen users who began menstruating on the early side, it's not likely to be anything anyone can reliably use as a sole method until they're at least in their later teens, if not their twenties. Too, to use FAM effectively as a method of birth control, a person usually needs to chart daily for at least six months before using it, a waiting period which young adults who want to become sexually active may not find practical or realistic.
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