How likely is it to get pregnant if you have sex while your on your period?

Unlikley. Depends on the cycle length. Sperm could potentially be viable and effective for up to 6 days inside the body. If a woman has a cycle length of 21 days then she will ovulate about cycle day 7. If she has a five day period, then there is the small possibility that having sex during the period on or after cycle day 2 could result in a conception. But, with a 28 day cycle there would be no chance.

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