Took levonorgestrel tablet how long to come menstruation

Levonorgestrel tablets is a highly effective progesterone, is an emergency contraceptive ingredient, on women's normal menstruation may lead to certain effects, normal withdrawal bleeding within a week of withdrawal, if the levonorgestrel tablets taken before menstruation may lead to the postponement of this menstruation. If more than ten days, still no bleeding phenomenon, need to consider the possibility of contraceptive failure, need to timely detect blood HCG to rule out pregnancy. If the withdrawal bleeding, the amount is relatively large, it is similar to menstruation, can be regarded as this menstruation.