A member asked:

My ultrasound said my due date is august 29 is it 100% i got pregnant in december i need to know its guaranteed! can you help me here thanks?

4 doctors weighed in across 2 answers

Not enough info: Ultrasounds are more accurate for establishing the due date when performed in the first trimester. With a margin of error of 1 week. If done in the third trimester the margin of error could be 2 to 3 weeks.

Answered 12/17/2014

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Dr. Bruce J. Stringer answered

Specializes in Radiology

Buy a car: If you want a guarantee, buy a car! since you were given a due date of aug. 29, you had to have had a very early fetal study, those dates would make you 6wks 4dys as of today (1/7). Estimate should be accurate to less than a week. Estimate of conception would be around dec. 6. Now, if you actually conceived 4 days earlier and had sex with undesired father nov. 30, it is barely possible he's it!

Answered 1/8/2013

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