When did your belly button pop out?

I have an "innie-outtie"... A belly button that doesn't stick all the way out but definitely isn't just a while in my stomach either. You can always see it, it's more like a sunken button!

Well now that I've tried so hard to describe to you the state of my belly button (weird), I'm asking for those who had their belly buttons stick out (you know, like when you can see your belly button through a tight shirt), when did it pop out? I'm only 13 weeks and am nervous that it'll happen sooner than expected because it seems to already be halfway there!