Feel like my insides are going to fall out of me

Natalie
This is my second child. I'm 21 weeks today. I do not remember it feeling like this with my first. It started out as pelvic/vaginal pressure. Now, if I'm on my feet for a bit, it feels like my insides are going to fall out of me like a hernia or something, and the only way to relieve the pressure is to clutch myself down there from behind and pull upward. But, of course, that's not suitable in public. I found a belly band with groin compression straps—looks heavenly! And I will ask my doctor about this on Friday, but has anyone experienced this kind of pressure and pain? Are there any exercises that can help? I'm not even that big yet (see photo)! TIA!