15+4 cramps and spotting after sex?

Nat

This is My 4th pregnancy and 3rd baby and I have never had this, I know It can be normal but these cramps just are not going away, I emailed my ob but she hasn't gotten back to me yet. I only had like 4 little light pink spots when I peed last night and once today. I'm just more concerned with these cramps. Iv been slamming water. I'm at work so I can't bathe or anything.