A member asked:

Does the measurement counting from sonogram begin once the sperm fertilizes the egg or once the egg implants itself into the wall of the uterus?

A doctor has provided 1 answer

When embryo implants: Dates reported on the sonogram (or ultrasound) report are referenced from the first day of bleeding of the last menstrual period. The earliest exams are the most accurate for predicting delivery, since the fetus develops its individual characteristics as it matures.

Answered 2/1/2013

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How long does it take a fertilize egg take to get the uterus?

2 doctors weighed in across 2 answers