Curious about baby’s size?

JLE

So I’m 33w3d and I have only gained 13 pounds so far this pregnancy. I’m just wondering how much of that is actually baby and how much are other contributing factors?(placenta, fluid, etc.) I guess I’m just nervous about baby girl being small is all🥺 first pregnancy I gained 25 pounds total and she was born 7lbs 2oz for comparison/reference