Mine is measuring at the 23rd percentile. Still a healthy baby!!! The doctor told me our height also affects it ; I'm really short so I'm not worried about it being a weight issue
The nature of percentiles is there is always going to be babies on the smaller side and the bigger side, it's just how it works. If your doctor isn't concerned, don't worry. Stress isn't good for you or baby.
My guy is at 27%. As long as they're above 10 doctors are happy!