Should I be worried ?

I took a plan B pill on the 18 for the time I had intercorse on the 16. Had intercorse again today. He cummed before actually having intercorse and washed off his private just to make sure. We did it for at least 2 mins not much. No pills no nothing. Should I worry? I'm suppose to start tomorrow but I know hat plan B can make your period come later than predicted. What do you guys think? I'm feeling very emotional, moody, I'm getting acne breaks. I'm having some cramps. What do you guys think?