Mine was right, but I would never take it to the bank depending on how early it was. Mine was done at 13 weeks and they said boy, but I waited until my next u/s at 18 weeks where they said boy again. Now I believe it.
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Re: If your NT scan included a guess on the sex
With my first pregnancy, the tech guessed boy and was correct.
With this one, the tech guessed girl and that's the guess I got at the anatomy scan, but we won't know for sure until June!