I Have Been On Birth Control For A Couple Years

I have been on birth control for a couple years now, and this has never happened. My boyfriend and I just had unprotected sex the 28th, the first time I have had sex with him, or anyone in over a year. He didn't ejaculate in me, but pulled out. I haven't stopped cramping, with the cramps getting worse everyday since the day after we did it, and there's a lot of white discharge. This never happened with my ex who I always had unprotected sex with. So what is it? This started the day after we had sex.