Plan B

So my boyfriend and I had sex I believe it was Saturday where he was dumb and decided to stick it in without a condom just for a couple minutes. He didn't ejaculate. I was ovulating at that time which it was my 3rd day of ovulation. I took the plan b pill Tuesday night. It's been 3 days and I just have cramps down there. Do you think I could be pregnant? I start taking birth control my next period.. I really hope it comes 😕