Y do i have 3 different due dates/ which to follow. i have 12/9 my doc, 12/11 hospital sono, 12/15 reg sono place lmp 3/2, sex 3/14 & 3/23. follow wc?

Due dates: The earlier an ultrasound is done the more accurate the due date. How early did the ultrasound say you were, this is the ultrasound that I would go by, the one done earliest in the pregnancy. It appears that it is the one done at the hospital.

Due date: The measurements on a given ultrasound can vary by the rate your baby grows, and not every baby grows at the same rate, so the "due date" is just an average for a specific infant, and will vary. The dates you mention are all "possible" , and in reality may NOT be the actual date, but you can be fairly certain of having your baby by mid-December !