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A member asked:
Are conception calculators accurate based off first ultrasound?
A doctor has provided 1 answer
Conception determined by "first U/S" are approximate, and do not accurately determine the actual "due date" or ovulation date, as ovulation may be often delayed, and the U/S only measures correlation of fetal dimensions with estimated fetal age, but size and growth rate variations distort the accuracy of either due date or last ovulation.
Answered 11/4/2021
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Don't need to pinpoint conception day, but two first trim ultrasound give same due date we have no lmp to go off, how accurate is age of our baby?
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