A member asked:

My lmp was march 24th i got a + preg test a week after my missed period. my due date is jan 13 when it should be dec 29. my ga dates back to april 15?

A doctor has provided 1 answer

Gestational age: The estimate of "GA" is often based on an early ultrasound, and that in turn is based on the size of the fetus (head circumference, etc.) which may vary as the growth patterns are different for each fetus. The "prediction" of "due date" can be off by a week or two if calculated only on the LMP. Ask your OB provider for more details.

Answered 11/19/2017

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