Baby weight at 34 weeks?

Hi ladies I’m currently 35 weeks 2 days pregnant with my second child. I had an ultrasound last week at 34 weeks everything looked good they estimated him at 4 pounds 8oz. They said everything was normal. Now my doctor wants me to get another ultrasound in 2 weeks to make sure he’s growing. I’m a little scared now. My first son was small he weighed 6 pounds 7oz born on his due date.

I think I just make small babies I’m a petite person. I feel my baby move a lot and I’m definitely bigger than with my first. Anyone else have a small baby? I know they are only estimating but I’m worried now. My doctor said he’s in the 15th percentile.