Help Please?

On May 1st I started birthcontrol first day of then first week for the first time. I had sex on the 7th and my boyfriend didn't cum in me but bery close to my vagina. I still continue to take my birthcontrol every night at the same time. Well yestursay the 10th I was freaking out and I went to get Plan B. There no way I could be pregnant right? I'm having cramps and I don't know why. I still have 9/10 days till my next period.