Head circumference 8%tile?

Just had a scan today (27 weeks) and when I looked over the scan, the HC (head circumference) was at 8%tile while everything else was 20+%.

Did anyone have a similar case and had baby with a normal HC?? Idk why I’m so worried. Doc said they didn’t seem worried and even if there was anything, can’t do anything about it till baby’s born. For some reason I don’t feel reassured...

Any positive experiences would be greatly appreciated!