Small HC at 28 weeks?

I just had my 28w ultrasound and for HC it was only 253.4mm (~25cm) and says it corresponds to almost a week behind (like 4-5 days behind). Everything else (like AC and femur length) were measuring on time if not a little ahead.

Anyone have anything similar or a similar HC at that gestational age and baby was ok? Google scares me with talks of microcephaly etc :(((

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