Accuracy of “measuring ahead” at ultrasound?

knottie56d2e189539ed26c

Hi! I’m a FTM due with a baby boy on 10/6. I just had an elective ultrasound and the tech said he was measuring a week (and a pound 😅) ahead with an EDD of 9/22. I’m wondering for any second time moms - if this happened to before baby was born, was it accurate? I’ve heard from others that they’ve had this happen and they aren’t actually that big when they’re born.