2 doctors weighed in:

Unknown LMP but dating scan measured baby at 63.9 at 12 weeks and 5 days. Is 12 weeks and 5 days when i conceived? Edd is 8 february.

2 doctors weighed in
Dr. Erinn Huffman
Obstetrics & Gynecology
1 doctor agrees

In brief: No

Generally ultrasound dating is using the gestational age, which means it is 12 weeks from your last missed period.
Generally date of conception is about 2 weeks less than last period. So about 10 weeks ago.

In brief: No

Generally ultrasound dating is using the gestational age, which means it is 12 weeks from your last missed period.
Generally date of conception is about 2 weeks less than last period. So about 10 weeks ago.
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