Scan showing baby with large head - worried about abnormalities

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I am hoping someone here may be able to help. I went for a growth scan yesterday at 28 weeks as my first baby was very small. The measurements this time were showing normal (AC about 70 percentile, femur length 40 percentile) except for the head circumference which was on the 98th percentile.

Both me and my husband are fairly small and big heads don't run in either of our families. Now I'm really worried that something is wrong with the baby. I obviously don't mind them having a big head at all, but I just want to make sure it's not a sign of another issue with their brain development.

Anyone have a head circumference measurement that was large and didn't have a history of large heads in the family? Any other advice?

Thank you in advance to anyone that responds!

Take this with a pinch of salt. I had growth scans - baby measuring small and there was quite a fuss with it all. Despite me being just over 5 foot so hardly a giant.

Anyway for completely unrelated reasons by baby was born at 38 weeks EMCS - they were so concerned about his 'small size' they have me steroids etc on admission to develop his lungs.

He was 7lb 5oz and entirely average (between 25th & 50th)