I've had a few unprotected sex with my boyfriend a couple of days ago. And tomorrow is supposed to be the first day of my new period cycle. But I am experiencing the worst cramps, and the cramps are different from the previous cramps in my life whenever I was on my periods. My stomach seems swelling too, and I have this kind of spotting. But there's no period blood, so that means i'm not on my period, yet i'm still experiencing cramps. Can anyone please explain?