For comparison's sake, here is me pregnant with Will at about 35 1/2 weeks on Easter Sunday 2008. I carried pretty high with him and didn't get big until the end.
We had a sonogram done a week ago and I asked that we do the 3d/4d ultrasound at that visit. Then I found out it would be an extra $150 so when they called the day before to confirm my appointment, I told them to cancel the 3d/4d part. They didn't make us pay up front for the 3d/4d so I forgot to mention again we didn't want it. (Well I did want it, but I didn't want to pay the extra $!). So the tech took us back and did the usual measurements. Then she said, "Ok! Now for the fun part!" and turned on the 3d/4d. In my mind I was thinking 'Tell her to stop! We can't pay for this!' but I was powerless to stop looking at the sweet little face on the screen. We got to see the baby smile and suck his/her thumb. It was so sweet. So I guess we will be getting a bill for that part of the ultrasound. I think it is worth it, though!
PS: I totally think it's a girl!