Growth chart worry

Hey

So my first X at 28 weeks 4 days (midwife tape measure)

Second X at 30 weeks 4 days. Growth scan.

I’m just worried because baby was on 95th centile n now on 50th..

Hospital said everything looks normal, but to me baby’s weight has dropped!!

Could it be the tape measure measurement is not very accurate??

Help I’m worrying

X