I am not a pharmacist, and I've never taken the \"morning after pill\", but I am a young mother of two who has worked in pharmacy for almost 7 years. Yes, those \"morning after pills\" can affect your period, but you may want to take a pregnancy test just in case. Especially if this was not the first/only time you've had sex. Those pills are intended to prevent a conception, but in most cases will not terminate an existing pregnancy. In fact one of the two brands available - Preven - actually came with a pregnancy test so that this could be determined ahead of time. (A pregnany test will only detect the hormone if you are to a certain point - around 2 weeks after conception or 4 weeks after your last period). The other brand which is more widely used - Plan B- does not come with a test. In most cases women who took the pill after they were already several weeks pregnant, went on to carry a healthy full-term baby if they choose not to abort.
If you have any more questions, I'll try my best to answer them. And I'll be praying for you! - Heather