So, my doctor had me at 9 weeks pregnant, with a due date of September 17, due to my last menstrual period. Well I had an ultrasound the other day and they said my baby is measuring 6 weeks 1 day. However, they kept my September 17 due date. Makes no sense cause that would make my due date October 8. I asked them, and they said I still got pregnant from my December period, just a little later than normal. But still... why keep my 9 week due date? How do I track it now, because all the information for that due date is for a more developed baby. Do I track by baby oor by due date? Should I expect to carry past the given due date? This is confusing.