with my last 2 they said I was a week early then what I thought I was (I was 7wks they were saying I was 6) I told them It was a lie I knew exactly when I conceived down to the T.. ended up having them (water broke day b4 MY CALCULATED DUE DATE not by doctor ultrasound )

mine been off by a few days. but baby number 2 was 2 wks early and number 5 was 3 wks early