Can a due date based on an ultrasound be less accurate than based on the LMP? My OB originally gave me a due date of 11/21 based on LMP, then bumped it down to 11/15 based on an early scan. Well, 11/15 has come and gone, the baby seems quite content to stay put, and I'm looking forward to still working tomorrow - after telling my boss and everyone that I may not be around all of last week Thanksgiving this year is going to be... interesting.

I don't know if I should be worried that baby is overdue, or if it's just that my original due date was right.