Help?!?!

Alright girls I have a serious question. I had a miscarriage 11/20 at 5w6d, so 10 days ago, I had unprotected sex 11/26, 11/28. When I was pregnant I had a feeling I've never experienced before... It was a low key burn not where I pee but in my vagina almost like you're supposed to start your period but your body is holding it back.. Kind of like an icy hot feeling. Since my miscarriage I haven't felt it but today I'm feeling it all day! What could this be??