So i went to the doctor today & my LAST appointment they told me they think my baby is going to be…

So i went to the doctor today & my LAST appointment they told me they think my baby is going to be small not that it was bad BUT i got measured today & my daughter is only measuring 30 weeks, & im 33 tmrw? So next appointment i'll be having an ultrasound done. Any mommies have the same problem. Should i be worried. 😩 won't be seeing my doctor till march 8th.