Riddle me this.... Cause i cant figure it out

OK, I'm almost 14 weeks. I've only gained between 3-5 pounds (depending on if I did #2 recently lol). The top of my uterus is still sitting at or just below my belly button.

So how is it that I'm looking more round above my belly button? My uterus isn't even up there yet. And surely you can't really notice a 3-5 pound gain on a 175 pound person. The bloating is down, my pants fit like they did before I was preg. Are my organs being pushed up and that's what's making me look heavier on my upper belly?

I mean, it looks like I've gained around 15 pounds, and I'm only up 3-5.