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A member asked:
Could very early ultrasound (5 weeks) be not accurate? it showed only 4 weeks, what doesn't match my ovultation. at 12 week it was correct...
A doctor has provided 1 answer
That's correct: The accuracy is plus or minus a week or so. The prenatal ultrasound dating scan done at 8-11 weeks is more accurate. That means when the doctor says, "The scan dates your pregnancy at 9 weeks," he is actually saying, "The scan dates your pregnancy at 8 to 10 weeks." In almost all normal pregnancies, the exact dates are unimportant.
Answered 9/14/2016
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