The absence of bleeding after taking the emergency contraceptive pill is normal. It is usually due to hormonal insensitivity, thin endometrium, completed ovulation or contraceptive failure. If there is no other discomfort, there is no need to worry too much. If there is no bleeding for more than one month, you can test whether you are pregnant by using early pregnancy test paper. Common reasons 1. insensitive to hormone: emergency contraceptive pill contains a lot of progestin, but if the patient is insensitive to hormone, it will not cause endocrine disorder or endometrial reaction, so it will not bleed; 2. thin endometrium: vaginal bleeding is usually formed by shedding of endometrium, if endometrium is too thin and difficult to shed, it will not cause bleeding; 3. ovulation has been completed: if taking emergency contraceptive pill The time is the second half of the menstrual cycle, in fact, ovulation has been completed. Although there is thickening of the endometrium, but with the support of progesterone, bleeding does not necessarily occur after taking oral contraceptives; 4. Contraceptive failure: If the pill expires or fails, or if it is taken in an improper way, it may lead to contraceptive failure and conception. Patients can use pregnancy test paper to detect whether conception, but also to go to the hospital for examination. Note after taking the emergency contraceptive pill is not a routine vaginal bleeding, no need to worry too much, to maintain a relaxed and calm state of mind.