Cramps after sex?

Finally pushed through our second first time (actual first time didn't work out and we had to stop, too painful). It hurt like hell but I knew I had to just do it so it would eventually get better. Since then (going on 3 days now) I've felt like I did after I delivered my LO! Constant cramping, random sharp pains, and it feels like my vagina is just gonna fall out!!! Normal? OB said everything looked great and perfectly normal at 8 week check up. I'm so scared to try again!