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A member asked:
Can an ultrasound at 12 weeks be off by 3-4 weeks? if u were 12 weeks, and its showing measurements of 8-9 weeks than your due date would surely change
A doctor has provided 1 answer
Yes.: Your due date will change during the first trimester if the difference between period and ultrasound is more than 1 week.
Answered 9/3/2017
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My due date is july 25th 2014 but my ultrasound stated i was "measuring 2 days bigger"in my ultrasound yesterday does that change my conception dates?
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Is the margin of error in a 1st trim ultrasound based on error of measurements or assigning a due date? I hear diff things about how "off" they can be
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