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Hi anon, Welcome to EmpowHER. If you took it as instructed, it you protect you. You need to wait until your period is due and take a pregnancy test. Any emergency pill can cause changes on your next period. Such as a earlier or later, heavier or lighter period. To avoid an unwanted pregnancy you should use protection such as a condom or birth control pills. Best, DaisyNovember 2, 2012 - 7:01am