A 34-year-old female asked:
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ultrasound says my fetus is 6 weeks 2 days but my gestational sac is 7 weeks 2 days. heartbeat is normal. is everything ok?

1 doctor answer
Dr. Erinn Huffman
10 years experience Obstetrics and Gynecology
Most likely: The most accurate measurement of the fetus is the crown rump length. The gestational sac is like a fluid filled balloon, not a perfect sphere. So the measurement of the sac can vary quite a bit depending on what part was measured. If there is already a fetal heart beat, that is a great sign. Keep your follow up appointments with your OB doctor.
Answered on Nov 27, 2017
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