Question about weight

I’ll be 34 weeks tomorrow. Believe it or not I have NOT gained a lb!!!! At my first appointment I was 158 and my last appointment I was still 158! So my question is, if you never gained weight either was the baby still a good size or small? I haven’t had a ultrasound since 24 weeks and she was 1lb then. Not sure when I’ll be getting another one to see how much she weighs. I’m worried she’s gonna be small.