My boyfriend and I had a slip up in the beginning of November so I took plan b. At the end of the month I had what I assumed to be my period. December passed with no period, so I took a pregnancy test just to calm my worries and it came back negative. I’m supposed to be on my period right now and I still didn’t get it.. is my cycle just still messed up from the plan b? I’m on birth control but I missed a few pills the week I took the plan b.