Nervous and need advice


So, I'm 22 weeks pregnant with my first pregnancy. Went for my 20 week scan a few weeks ago and found out we're having a baby girl. But yesterday at my normal obgyn appointment I found out that at that scan shes only at the 29th percentile in growth. I gotta go back when I'm 26 weeks for another growth scan. I feel her move sometimes but not as much as I would like. I'm a little on the chunkier side, dont know if that has anything to do with why I dont feel her so much. We have a nice strong heartbeat at 149. I'm just nervous something is going to go wrong and that shes not going to grow as well as she should.