Help...what’s wrong with me

Hello all. We’ve been trying to conceive on and off for 2 years now. I ovulated about two weeks ago and BD’d. My period came on time so I was devastated but this period lasted 5 days longer than my normal 3 and my period just went off Tuesday but now today I’ve been severely cramping. It’s worse than any cramping I’ve felt before and I’ve never been pregnant and never went through this type of pain before. Any suggestions or has anyone else gon through this???