My boyfriend and I were virgins, and had unprotected sex, but he and myself did not ejaculate. I took Plan B the next night because I was worried, and was feeling regretful and upset for being so stupid and unprotected. About 1-1.5 weeks later I got what I believed to be my period. It would have been 2 weeks early had I not taken Plan B. That was May 1st when I got the Plan B related period--it lasted about 5 days (normal for me). Now it is May 31st, and I still do not have my period. I am very worried that I might be pregnant. I haven't taken a test yet, but will this week...but am very confused if my delay in period could be related to the Plan B. Does Plan B affect your subsequent menstrual cycles? I appreciate any help you can provide, I am so scared and terrified, and the information that is available on the internet is very confusing, and makes me very upset. And I know stress can impact your period, so it can't be helping. I am waiting to get my period so I can have my depo shot and be protected.