So painful.

So for the past week or so when I stand ( usually later in the day or after sitting for a while I get this horrible horrible pain in my lower abdomen and back/butt. It doesn’t feel like round ligament as it’s in the center or my abdomen and it doesn’t go away. It helps to put my hand on my belly to kind of support it ( does that make sense?). And the pain will go away when I sit or lay down. It’s really starting to concern

Me. I have a doctors appt next Tuesday where I’ll of course bring it up. But has anyone else experienced anything like this?