Hi The emergency contraceptive pills like I-Pill are generally safe. However I-pill may cause certain side effects like irregular bleeding or spotting until your next period. Your period might be different. Most women will have a normal period at the expected time, but some may have their period later or earlier than normal. If your period is more than 5 days late or is unusually light or unusually heavy, or especially painful, you should contact your doctor as soon as possible. Besides, you might have breast tenderness, headaches, lower abdominal pain, diarrhoea, feel dizzy or feel tired after taking this medicine. These symptoms should get better within a few days. If the symptoms do not go away or get worse, you should contact your doctor without delay. These changes are related to the high content of the hormone present in the I-pill, and they are usually temporary and reversible. Hope these answer your query.