Based on the menstrual period, how can I figure out when ovulation occurs? I was told by a friend 15 days, but want to be sure. How long does ovulation last? I went off the BC pill and want to know during what period I can get pregnant.

  • A general way to figure out when ovulation occurs is to subtract 14 days from how often you have a period. (e.g., if menses occurs every 30 days, then 30 -14 = 16.) So on day 16 of your cycle (your cycle begins on the first day of your period) is the time ovulation is most likely to occur. Your most fertile period is 7 days before (because sperm hangs around in the cervical mucus for up to 7 days) and 2 days after ovulation. I hope this helps.