When did your belly button 'pop'?

[Miffster]

Mine has s-t-r-e-t-c-h-e-d at 26+2 but has not popped yet, and the thought of it stretching so much that it ends up turning inside out makes me want to boak.

I am hoping against hope that it stays in.
But will it?
When did yours pop out?
Or did it stay in?

I'm 30 weeks and it's just going! It popped in my last pregnancy and went back afterwards too...