Okay...so my boyfriend and I had an "accident" of sorts while having sex in the beginning of August. I, of course, panicked when my period was two weeks late; however, I did HAVE my period in August. It was just late. Since then, I have skipped all of September and have yet to have my period in October. I've taken three home pregnancy tests (the last was taken one week ago), and all were negative. I'm still just nervous since I haven't had my period. I recently started back to an insane schedule in college, am under incredible amounts of stress, and also went off of the pill two months ago...so I think it could possibly just be stress, the lack of the pill regulating my period, and being around so many new women, too. Am I worried for nothing? After three negative tests, I should be fine...right?