A member asked:

What are the differences in days 1-4, 5-13, 14, and 15-28 of the menstrual cycle when fertilization occurs? and when it doesn't?

A doctor has provided 1 answer
Dr. Seth Derman answered

Specializes in Reproductive Endocrinology and Infertility

Midcycle: Ovulation usually happens at mid cycle, which is about 2 weeks before the onset of the next period. That would be around day 14 with a 28 day cycle. Keep in mind the sperm can live in the cervical mucus for up to 3 days extending the fertile period.

Answered 5/23/2013

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