I just reached my 4th month of pregnancy. I normally have an innie belly button. (it's normally so "in" that you can't see all the way in it.) anyway, as of today, it has opened up and has become more shallow... I've heard of belly buttons poping out, but not this soon. This is my first child and I am not over weight. What is the usual time (if there is such a thing) that most belly buttons pop out?