Pain after sex

Tiffany

The last 2 times after sex ive experienced pretty terrible pain in the lower part of my stomach and from my butt shooting up my spine after walking around and a hot towel it seems to go away on its own. A little tmi but while there’s this spot inside and if he hits it by accident it hurts bad. Idk what it is or how to make it go away but it only is in the way once in a blue moon never 2 days in a row. Any clues on what it may be anything helps.