First pregnancy questions :)

Tanasia

Hi everyone! So I have a quick question. This is my first pregnancy, and I am wondering why my bump looks bigger at some times and smaller at others? Also, before this pregnancy I lost 120 pounds and sometimes struggle with the weight gain. I was pretty fit (I had abs) and now I worry about what is going to happen after. I try to stay active, and eat as healthy as possible, but there are days I feel like I have failed. Any tips??

23 weeks here