I'm so worried

I'm 32 weeks pregnant and my sweet baby boy is big than what he should be his already 5lbs. I still have 8 weeks to go. I'm so nervous baby is going to run out a room to grow and I was hoping for vaginal birth another re-scan will be in 4 weeks to see if he still growing big. Anybody who had the same situation and everything ended being ok? My gestational diabetes test came back negative when i did it, everything was normal so I don't know why my boy is big than what he should be lol 😆😂 I don't know if that's a good thing or not but I'm worried smh