Baby weight

Hey mammas ok I know I shouldn’t worry and idk why I keep thinking he’s going to be really big at birth , I’m doing everything I can to eat healthy and workout by either dancing or walking , I just don’t want to have a csection but I keep thinking he’s going to be 8 lbs 7oz ! But idk ig I’m kinda a little worried that’s he’s going to be bigger bc yes he’s growing like he’s supposed to but it’s tight inside my uterus! And is baby supposed to gain one or two pounds every week ? Or is some of the weight me ?