Yes, but not just 1. If you take 2 pills the morning before and 2 pills the night before, this will probably delay your period for about 3 days.....but you may experience very light bleeding anyway, and expect your next period (the following month) to start later than usual. Also, expect to get a little sick at your stomach so prepare ahead with some Pepto Bismol or other over the counter anti-naseau medication. Also, do not use this method to delay a period of you smke or have high blood pressure. It could be dangerous.