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A member asked:
Can a 13 week ultrasound mistakenly put me at 9 weeks?
6 doctors weighed in across 2 answers
No: There is a maximum of 1 week difference between measurements and dates in the first trimester. Perhaps your dating was incorrect to start. Otherwise there is an issue with fetal growth.
Answered 5/22/2013
5.1k views
Unlikely: A 13 week ultrasound is very accurate if done by a well-trained doc or tech. Growth abnormalities usually don't surface until later in the pregnancy & the difference between a 9 and 13 weeks fetus is easy to see. If you notice the 4 week discrepancy, it is much more likely that an ovulatory cycle was missed.
Answered 12/26/2022
5.1k views
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