Dec26 or 27 or 28...: Conception is one moment in time, so it begins and ends around the same time. It begins when one sperm successfully merges with one egg. That can happen the calendar day of sex, to a few days afterwards. In this case, it would be Dec. 26 or 27 or 28 or 29 or 30. In reality, nobody knows exactly when it happens, and it does not matter at all what exact moment it happens at.
Answered 3/25/2015
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