9/26/14: The date of conception would be approximately 9/26/14. This is not exact because there is a margin of error in the 20 week dating depending on how and when it was obtained. It is impossible to know that she is 20 weeks as opposed to 20 weeks and 1 day or 19 weeks and 6 days at any stage of dating. Hope this helps.
Answered 1/30/2015
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September: 20 weeks gestation on 1/29/2015 is consistent with a conception happening on or about September 24, 2014. Of course there would be a range of at least a few days one way or the other.
Answered 1/30/2015
3.3k views
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