I had some belly action too before I was pregnant, my niece called it "Aunt Dava's special fluff" lol. I wasn't huge, but I had a belly, and now my belly is huge. I didn't notice my belly growing until I was 22 weeks along though.
I had what I fondly call "a little extra padding" prior to pregnancy, and I showed early and that's held true throughout. I'm almost 26 weeks now and look like I've swallowed a basketball lol, some women look like I do when they're full term. So I think it's kinda up to the rest of your build; I'm a shorty so I think that's one of the reasons I'm consistently big, the baby doesn't have anywhere to go but out.
Mine didn't start showing until almost 18 weeks and I had a little belly before that. Now at 25 weeks I'm huge, lol.
Your belly button might not become an "outie" if you have an innie.
The change your seeing now is only bloating but yes you will have a belly once you get into your twenties like the above poster said!
You are only 9 weeks, you are going to see a lot of changes over the course of the next 31 weeks, especially when you start getting into the 20's. If you have a little belly already it just may mean people wont notice your baby belly as quickly.
I started out my pregnancy with a little belly and now I have a HUGE baby belly lol. The only thing I don't like is I have a little pooch at the very bottom that I think looks funny.