Belly measurements advice.

Hello, had my antenatal appointment today, I'm 29+4, her heart beat was regular, but when she measured my stomach she said it was 28cm. I asked if that's something to worry about and she said no, but ofc, it's bugging me!
Baby is just above the 10th percentile line on my graph, and she didn't order any scans. 
Just wondering if any other women have had something similar, their stories really! FTM and rainbow baby so everything worries me😞