Cramps and spotting

So i had sex with my husband on Tuesday, unprotected, and then the next day I started spotting. By the end of the day, late at night I started getting really bad cramps. It's already Saturday and I am still spotting. Also in the afternoon I started feeling pelvic pain. Has anyone else gone through this. I think this might be because I just started ovulation yesterday but I am not sure what to do. Should I go to the doctor?