Hello there, thanks for posting your query! You must understand that I pill contains progestagen which acts like progesterone hormone in the body and is an emergency contraceptive intended for single use. Irregular bleeding is quite likely to happen when it is taken more than once as it contains a higher dose of progestagen and it sets in a hormonal imbalance and it could be your periods or a breakthrough bleeding. However, I suggest this hormonal imbalance is self limited and it usually resolves by itself. Do keep a watch on menstrual flow. If your bleeding tends to be prolonged and doesn t stop you may need medications to stop it. In that case you must consult your gynaecologist. Also, consider using oral contraceptives or condoms to avoid unwanted pregnancy rather having to resort to emergency contraception every time! Hope this helps, take care!