measured 36 weeks today, have to go back in 2 weeks so they can do a growth ultrasound. I'm…

measured 36 weeks today, have to go back in 2 weeks so they can do a growth ultrasound. I'm measuring 4 weeks ahead, I don't have diabetes or blood pressure issues I just have bad swelling in my feet and legs because I've got a big ol belly! anybody else have this issue??