Ob-Gyn questions? Ask a gynecologist online.
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An ultrasound can be off by three weeks depending on when it was performed. As a general rule of thumb:
1st trimester ultrasounds can be off by about a week
2nd trimester ultrasounds can be off by about 2 weeks
and 3rd trimester ultrasounds can be off by about 3 weeks
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i was sure that it was the guy from nov, everyone kept tellin me oct 17 was to far back for a 08/01 due date