Growth scan. 30w1d and baby drop from 30 to 12 percentile

Kelly • First baby on the way after 4 yrs of trying 😍

I just had my growth scan. All is good but then dr. Schedule me for another scan after a week to check if baby is growing. They said from 30% she drop to 12% which is still within normal range but just to monitor. If it still drop after a week then maybe i need to deliver early. Dr. said she is a small baby at 1.3 kg at 30w1d but still within the range. Anyone else has the same experience? Did you have to deliver early? My baby is healthy and all but only this Percentile thing is quite scary for me.