Well, it's confusing with the pills you took. Plan B normally works very well when taken correctly. I'm not sure if the two BC pills did anything. I think you will likely be really irregular (regardless of going on the pill) for the next 2 months. You may experience some irregular bleeding. Like spotting. That's probably what you have with regards to the cramping, spotting. You can take a pregnancy test to confirm you are not pregnant at 2.5 weeks past when you had the sex. I don't think you sound pregnant.