14 days before start: About 14 days before the expected start of the upcoming period, one is likely to ovulate. Of course, it can vary from woman to woman, as people are not identical. That means a 28 day cycle = ovulation on or about day 14, and a 30 day cycle = ovulation on or about day 16 of the cycle (14 days before the first day of the next period).
Answered 11/28/2017
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