That just happened to me today too. I thought I was 5/14 due date. But I switched doctors and he said every sono I've had which have been a lot at least 8 so far. Put me between 5/6-5/8 so he gave due date of 5/7.

due dates are a super gestimate, not a deliver by date. I was due February 3rd with my son, he was evicted via c-section on the 13th.

my ultrasound measurements were estimating a due date of July 8th but my period cycle due date is July 18th