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A member asked:
I had an ultrasound on 4/19 dating me at 9wks 4days. when could i have conceived?
3 doctors weighed in across 2 answers
Approx 2/25: A sono @ 9-10 weeks has an accuracy of about 5 days. So if a baby measures 9wks 4 days, the actual gestational age of the baby may be between 8wks 5 days and 10 weeks 2 days. If conception dating (based on a last period) matches the sonogram, the dates are confirmed. You would have conceived between 2/20 and 3/1.
Answered 6/22/2017
5.6k views
Subtract: 7 weeks 4 days. This will give you a rough estimate. Makes some assumptions such as a 28 day menstrual cycle and accurate measurements on ultrasound.
Answered 3/21/2013
5.2k views
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My first ultrasound showed only a 9mm gest sac. 2 weeks later they could see the baby, measuring 7w1d. How accurate are these measurements for dating?
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