My doctor (nurse, PA, mother, friend) says that NFP is the Rhythm System, and it doesnt work. How is NFP different from Rhythm?
Both methods are based on the woman being fertile only around ovulation time and infertile the rest of the cycle*. If the couple wants to avoid pregnancy, they dont have sex during the fertile time. Rhythm used a calendar calculation based on the womans history of cycle lengths. However, it is common for a womans cycle to vary, so that the calculation was no longer appropriate. Another problem was that it was common for women to be given various approaches to the calendar calculation, many of which were not effective. As a result, in practice Rhythm gained a reputation of being too unreliable to be used confidently. NFP uses real-time signs of the womans actual fertile or infertile condition within each cycle. If the time of ovulation varies from cycle to cycle, the timing of the signs will change accordingly. As a result, NFP is effective even for women with irregular cycles. Studies have shown that NFP when used correctly is in the same category of effectiveness as the most effective
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