Where your baby/placenta is positioned plays a role in how big you are or how much you show. Like PP said, if your doctor is not concerned, don't worry about it. I'm sure baby is fine.

With my first son I looked maybe 6 months pregnant on my due date, and it looks like I'm carrying the same way this time. Everyone caries differently and I agree with the last comment if your doctor isn't concerned about it I wouldn't be

I didn't pop until I was around 36 weeks. Everyone is different. If your doctor isn't concerned about your size don't worry