My first pregnancy my belly was 10th percentile but then was around 50th on the growth scan. Fundal height measurements are notoriously incorrect so try not to worry. My daughter was then born on the 91st percentile so honestly just take it all with a pinch of salt lol. I’m not getting fundal height measurements this time as I’m having scans every two weeks due to fluid in babies chest so they just do growth scans then anyway x
My measurement at my midwife appointment last week measured me over the 97th percentile, and after my growth scan, they estimated the baby to be on the 50th. Take it all with a pinch of salt.
I wouldn’t worry too much to be honest it can show up bigger depending on the way the baby is sitting in your tummy, my baby is in the 75th percentile which although on the larger side is not a concern