Pregnancy: only occurs when sperm fertilizes an egg. This occurs after ovulation, the egg being expelled at ovulation and being fertile for at the most 2 days. So there is a 1-2 day window for the sperm to fertilize the egg. Sperm can stay alive in the vaginal tract for up to 5 days. So if you know exactly when you ovulate and exactly when sperm is available you can determine if it is possible.
Answered 10/4/2016
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