11 week ultrasound? Transvaginal?

Ella

Im 11 weeks, 1 day. Due oct 8th. Technician measured 12 weeks, 5 days due sep 27th. She said shes not sure whether the doctor will change it to the new due date because it's a week difference but i think 11 days is a big difference

When i went in they did a normal ultrasound and i noticed it was a little difficult for the technician to see the baby in detail for her to take for the doctor. So after she then said she was doing a transvaginal one. Didn't say it was hard to see but that depending on how far along you are they use it. But 11 weeks is a bit far to need one right? Especially if i was measuring almost 13 weeks. We saw all the parts and baby was moving about and she was recording the heartbeat for the doctor and said it was 171. So im not worried but why was it so difficult to see. Is it because im overweight?

She had also asked for the second time if i had a c section with first because of scarring and i told her no i hadn't and that i hadn't had any surgeries