I went to my first appointment today which from my last period which I know the exact date the doctor told me due date is gonna be November 22 makes me at 9 weeks pregnant but I had an ultrasound after that and the tech told me I’m only 6 weeks and my due date is December 9th. The baby was seen thru vaginal ultrasound and it has strong heart beat. I’m not worried about when the due date is but I just found this odd. My sons due date changed a couple of times thru 3 ultrasound too but there wasn’t 3 weeks gap. What does this mean and can it change again on my next ultrasound?? The tech recommended that I have one again in two weeks because 6 weeks is too early for anything.