another ultrasound

Am I crazy to ask for another ultra sound?
At my level 1, I was 2 weeks further along then my OB/GYN thought I was.
Also they thought it looked like a girl but couldn't say for sure.
I had my level 2 at 19 weeks (instead of 20 because they scheduled it wrong, I don't know if that matters) but they still couldn't tell the sex. 2 technicians & a Dr. said it looks like a girl but it's no definite.
I know everyones different but from what I'm reading, hearing & feeling I don't think I'm as far along as they said. I think my OB/GYN was right in the beginning when he said I was 2 weeks earlier. I don't know if 2 weeks is a big difference but to me it is.
I want another ultra sound to make sure & to find out the sex but the girls in the office said the insurance doesn't cover it & I have to wait for my 35th week.
Could I insist on another one or is that unreasonable?

Re: another ultrasound

at my level 2 sono the baby kept moving so much they couldnt give me a positive answer if it was a boy or girl, but they said it looks like a girl.

I went back 2 weeks later for another sono & they wouldnt confirm 100% that it was a girl but they said it looks like a girl again.

we are just going by that because aparently the doctor at the hospital doesnt want to give 100% answer due to lawsuits if they are wrong.

if you feel you want another sono, ask to go back again, or ask your obgyn if they can do one in their office.