Bump?? Bloat?? Agh!

Desiree • Wife to T, mama to Lucy, cooking #2, and fur mama to 3!
So I'll be 13 weeks tomorrow and I was looking at diagrams of where your uterus is around 13 weeks and it's still at the bottom, right in/over my pelvic bone. But I have a bump...kind of. I mean, I can't suck in my tummy like I used to. So...why is that? Haha. I went to the doctor a couple of days ago but totally forgot to ask about that. That can't be my uterus right? Maybe it could be bloat? But it doesn't go down when I lay down. I have my NT screening on Monday so I'll ask then buuuutt until then...what do you think???