Yes: With regular menstrual cycles, one's ovulation day is about 14 days BEFORE the first day of the next menstrual period. So, one can mark on her calendar the first day she expects her next period. Her more fertile days are about 11-17 days BEFORE that marked day on her calendar. If a period is missed, she can do a urine pregnancy test 1 week after missing her period.
Answered 7/20/2016
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