###Human: Period become irregular after taking Unwanted 72. What to do? ###Assistant: Hi. Unwanted 72 is an emergency contraceptive pill containing high amount of progesterone. These medicines have a severe side effect of heavy or irregular bleeding. Your wife had the same side effect. Please check her hemoglobin levels; she might turn anemic if she bleeds much. Continue taking iron pills. It might take one or two cycles to get her periods to get regular again. So, preferably maintain a regular regime with condoms or oral contraceptive pills like Novelon, Ovral L, etc., rather than an emergency contraceptive. They are way safer.