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Figure 2. Algorithm for administering emergency contraception. EC indicates emergency contraception; IUD, intrauterine device; and OC, oral contraceptive. Unprotected intercourse or other indication for EC indicates a contraceptive accident, missed contraceptive pills, sexual assault, or exposure to a potential teratogen. New guidelines will not require follow-up with a clinician if there is no menses at 21 days; alternatives include home pregnancy testing or further waiting.