Painful sex 8 weeks after baby.

I am seeing a doctor tomorrow just so you know. So Last night we had sex and he did one deep thrust (usually doesn't do that) and it was so painful that I kinda shrieked and it took a few mins for my breathing to back to normal and for me to shop shaking. He said it didn't feel like he hit anything. Like it didn't feel like he hit my cervix at all. Has this happened to anyone else? I had a chriominitis (idk how to spell it, a infection in the uterus) when I was pregnant.