Hello, The following are few side effects of emergency contraceptives (iPill): Nausea or vomiting Dizziness Fatigue Headache Breast tenderness Bleeding between periods or heavier menstrual bleeding Lower abdominal pain or cramps Bleeding between periods is common with iPill. You don t need to worry. It will get controlled and regularity in periods gets restored. If you are not in favor of emergency contraceptives, your gf can go for combined oral contraceptive pills which help in regularization of periods and prevention of pregnancy. There are several options of contraception. You can try anyone. Just you may need to consult gynecologist for correct choice of contraceptive. Yet, for now, you don t need to be apprehended as the vaginal bleeding is very common and will get controlled. It doesn t mean periods will occur twice a month. Thus, please relax. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Pallavi M., Anesthesiologist