I had sex about a month ago. He used a condom and did not pull out. We we're almost positive that the condom didn't break; however, I took plan B about 10 hours later to be on the safe side. My period is now 9 days late. I just started getting sore breasts and have light cramping. Does this mean my period is on the way? I don't believe I am pregnant; however, I can't rule it out quite yet. Any advice? Can plan b do this to my period? I have also been under high stress lately.