Kidney pain during sex?

So girls, I was having sex with my husband and I felt a pain i’ve never felt before. Every time he would put my legs up in the air and go in deeper I got a sudden sharp pain in what felt like my kidney? Idk it was just a sharp pain that felt in my inside but the back if that makes sense? I decided to ride him instead to see if maybe the pain would go away but again if i moved his dick in too deep it would hurt, or feel really uncomfortable to even ride him good. I’m scared, has this happened to anyone? I don’t have insurance so I have to wait till thursday to go to one of the free clinics near my house if this keeps happening.