So my baby girl weights 7 pounds 6 oz and I’m only 37 weeks my belly is super small

And I haven’t gained that much weight actually in my last appointment that was 2 weeks ago I lost 6 pounds leaving me at 149 and today I am 155 so I don’t understand how this bb weight so much plus everytime my doctor touch my belly to like measure her he says she will be small I guess in length ? So my question is you guys think that she is in a normal weight doctor says she is but I’m scared to push a big baby 😐😩😫😆