DESPERATE for ANSWERS! I'm TERRIFIED!!! :'(?

Plan B is an overload of hormones, and shouldn't really affect when you get your period. In your case, it sounds like you were closing in the end of your natural cycle when you took it. The overload probably resulted in a hormonal hiccup. It happens sometimes, even in the best of cirstances. Cycles can also be upset by stress, and it sure sounds like you were stressing over possibly being pregnant. Stressing to the point that you have likely delayed this cycle. I think you shoud breathe out here, and ure yourself you are not pregnant. (unless of course- that is a new possibility based on having had unprotected this past month). If you haven't had unprotected since the June incident, you are not pregnant. You need to chill out and wait. Your cycle is delayed, but it will show up more than likely. The rule of the universe is that it shows up when it's least expected, and least welcome. If by chance, you do not have a period by the 7th of next month, then it will be time to visit your gynecologist. I don't believe that will be necessary. Try to remind yourself you are not pregnant, and relax. If you destress about this, it will probably happen.