right size for baby?

Des

So I feel like my stomach isn't growing enough to accommodate for my baby. 8 months pregnant. Have exactly 1 month to my due date (October 7th) and the way the baby pushes out my whole stomach just feels like he doesn't have enough room, and is trying to make more, but my stomach just won't move for him. And it hurts. And causes pain lower down towards my vaginal /rectal area. It's this normal? And is it possible to not be big enough for the baby. Second baby but I didn't make it this far with my first so this is all still new to me at this point.