question: hi my lmp was april 1 so that would put my due date jan7th. than my first ultrasound said jan 7th as well, but at my 20 week us the doctor says jan 27. than i had to change doctors and they said my due date is jan 6th. and im now 40 weeks and not dialated, and my cervix is closed, so the doctor randomly says im due jan 29th. how is that possible??? what if he is too big?