When did your midsection pop?

My upper abs have grown and feels hard to the touch. My lower abdomen has definitely popped out too.. However, the section by my belly button (where pants usually sit)  still hasn't popped. I'm at 19 weeks. If I wear maternity pants and empire waist shirts, it helps.. But this side B shape isn't visually pleasing ☹️ Will it ever pop out? Have any of you had this issue?