My last period was November 27th-December 2nd. My boyfriend and I had unprotected sex on the last day of my period I freaked out and took a plan b the next day. i had my "fake period" a week later. The day after Christmas we had sex with a condom but i later found out he had taken the condom off near the end but he pulled out in time. Today, January 10th, my period still haven't come. Could this be from the plan b or should i be worried?