Baby measuring in 91st percentile

Marcy

I had my 20 week ultrasound yesterday and my ob just called and said they want me to repeat an ultrasound in 4 weeks because he is measuring in the 91st percentile for growth! My husband is tall and I’m on the taller side as well. She said baby’s go through a growth spurt around this time and that could be what’s happening but I can’t help but freak out about this. If he stays in the 91st percentile what will that mean?