January 16-20: It is very simple when a woman only has sex once. Fertilization can be about 10-100 hours after the sperm start swimming. That means January 16-20, no matter what else is happening, because that would be the time the woman has fertile sperm inside of her. In a natural pregnancy, there is no answer to "exactly" when conception happens... because nobody can ever know.
Answered 6/5/2016
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