Remeasurment Scan..Have yall had this done?

Martha

I had a scan at 20 weeks and babys head measurement was 4 days behind🤷‍♀️ Wasnt sure what that meant cause everythingelse was measuring normal and on track..They rescheduled me for another scan (which was today) and I'm 24 weeks and 5 days..All babys body parts(legs,arms,belly etc) were all measuring on track head is still measuring 4 days behind..Is that normal?? Is she just going to have a small head? Petite? I'm confused!!!