The 3 days are 1 day: In general, it doesn't matter when one "got pregnant" if one had sex on those dates and is now pregnant, because the sperm are almost always from one man. Otherwise, the sperm from 3 consecutive dates would mix, and one would not know which person the sperm came from. That's a good reason to only have sex with one's husband. DNA testing can be done after birth, but often is not needed.
Answered 7/20/2016
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