Hi! Welcome to Health care magic. I read your query. As you said your wife took I pill as an emergency contraceptive pill, which indeed is the very core purpose of the pill. So, don t worry, it is safe. However, I would suggest that to avoid unwanted pregnancy, you should us other long term contraceptive methods and keep this I pill as emergency one only. It may cause some side effects like delayed periods or clotting but they are short term and does not effect future pregnancy anyhow. I hope this answer helps. Please consult Gynecologist if your wife face some side effects. Thank you!