Sex?!

I'm 4+6 and I had a miscarriage in June so I'm questioning EVERYTHING. I DTD earlier standing and now idk if I'm having cramps or is it just muscle? But it hurts around my uterus area and into my back like spasms. It doesn't feel like cramps but it feels like pressure but it's not painful just constant and dull. My lower back is throbbing almost and now my legs and thighs. Anybody else experience this?