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1 Record the number of days in each cycle, including the day you start your period. 2  The last day of each cycle is the day before your next period starts. 3  Keep tracking your cycle this way for eight to twelve cycles. 4  The more cycles you have to reference, the more accurate the calendar method will be.
Determining an ovulation cycle requires determining the length of the menstrual cycle. An adult woman's reproductive system. The calendar method is one way to calculate a woman's ovulation cycle. Timing intercourse during the days leading up to ovulation is the best way to achieve pregnancy. Recording body temperature daily may help a woman keep track of ovulation cycles.