Can dating ultrasound be wrong
Will they change my due date when they do my next one in a few days (will be supposedly 19 weeks then)? So yes, I think an ultrasound could be wrong although probably not often.
With all 6 of my pregnancies, only one due date was changed after the first ultrasound as that baby continually measured 2 weeks big.
Best thing to do is not argue with your Dr and be ready for that baby 2 months early.