A member asked:

If i don't have regular periods at my first transvaginal u/s will the doctor tell me age of the fetus according to conception?

2 doctors weighed in across 2 answers

Estimate: Yes this will provide a good estimate of age.

Answered 9/10/2013

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No, from period: The conventional way to date is from the last menses which is generally two weeks prior to ovulation, therefor even if you didn't bleed you are still going to have that 2 weeks added to your date of conception so that this is consistent with how all other pregnancies are dated.

Answered 12/9/2013

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