Belly button issues

At the beginning of my second trimester my belly button started to turn from an innie to an outie. Now I'm almost to the finish line (33 weeks) and my belly button is a big outie! Sometimes it's painful but most of the time it doesn't bother me. But I've always been scared that it's turning into a hernia and wanted to know if you can tell a difference? I see my ob Wednesday so I'll get her to look at it then but was wondering if any of you have similar situations or have advice or past stories to tell from experience with this!?!