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A member asked:
Lmp on 10/31or11/1/13 u/s 1/20 measured 11w3to4d. u/s on 3/28 measured 21w3d. accuracy? conception day? could 11/25 be conception? 30 day cycles
A doctor has provided 1 answer
11/14-11/15: Your first ultrasound is more accurate that the later one. The first ultrasound gives a conception date of 11/14-11/15. First trimester ultrasounds have an error rate of approximately one week (max). So that essentially rules out the possibility of an 11/25 conception date.
Answered 4/2/2014
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