It's just pain because contractions would be on and off pain and not consistent and all of that is normal
Yea it sounds like things are getting tight in there for ur baby and causing u pain. The baby grows so much in a short time ur body is reacting to the stretching & baby running out of room.
Same for me, its starting to get painful. Im 35wks too. When i sit up my stomach feel like its in knots. This is my third child so i know what contractions feel like, so im not worried about that