28 Weeks Scan

Anyone facing the same issue? I've been very worried cos I realised my baby's hc (head circumference) is measuring on the higher side at 70th percentile but the femur is on the lower side at 10th percentile. However my gynae doesn't seem to be worried at all. I was just told to come back for a re scan at 33 weeks. Should I be concerned? (previously, my 1st child also had a short femur measuring less than 5th percentile, but I wasn't that concerned then as there doesn't seem to be a high difference in percentile between the hc and femur length)