Slow growth?

Hi, FTM here. I just went for my 16th week gynae check few days ago and baby is gaining more weight than expected. However his CRL (crown-rump length) doesn’t seem as ideal. I read online and CRL at this week should be around 11.6cm but baby is only at 10.2cm. Dr said it’s okay but I’m still concerned. Should I be worried or it’s okay since baby is gaining weight? TIA!