If you're hoping to avoid pregnancy, unprotected sex is off-limits during your fertile days - every month. Plan sex carefully during fertile days.In this example, the first day of your cycle is the first day of menstrual bleeding and the 21st day of your cycle is the last fertile day. For example, if your longest cycle is 32 days long, subtract 11 from 32 - which equals 21.
This number represents the last fertile day of your cycle. Subtract 11 from the total number of days in your longest cycle. Determine the length of your longest menstrual cycle.In this example, the first day of your cycle is the first day of menstrual bleeding and the eighth day of your cycle is the first fertile day. For example, if your shortest cycle is 26 days long, subtract 18 from 26 - which equals 8. This number represents the first fertile day of your cycle. Subtract 18 from the total number of days in your shortest cycle. Determine the length of your shortest menstrual cycle.Using a calendar, write down the number of days in each menstrual cycle - counting from the first day of your period to the first day of your next period. Record the length of six to 12 of your menstrual cycles.Using the traditional calendar rhythm method involves these steps: You've recently stopped taking birth control pills or other hormone contraceptives.However, if you want to use the rhythm method for birth control, talk to your health care provider first if: Tracking your menstrual history doesn't require special preparation. The rhythm method doesn't protect you from sexually transmitted infections. In general, as many as 24 out of 100 women who use natural family planning for birth control become pregnant the first year. How well the rhythm method works varies between couples.
However, it's considered one of the least effective forms of birth control. Using the rhythm method as a form of birth control doesn't pose any direct risks. The rhythm method is an inexpensive and safe way to help you chart your fertility - the time of month when you're most likely to be able to get pregnant. Some women choose to use the rhythm method if a complex medical history limits traditional birth control options, or for religious reasons. The rhythm method can be used as a way to promote fertility or as a method of contraception, by helping you determine the best days to have or avoid unprotected sex.
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