Bleeding after taking the emergency contraceptive pill is gone in a day may affect the current menstrual period. This is a case of withdrawal bleeding, which occurs after taking emergency contraceptive pills and may affect endocrine hormone levels, disrupting the normal menstrual cycle and causing menstrual disorders. It should be noted that emergency contraceptive pills should be taken within 72 hours after sex, but it is not recommended to take too many emergency contraceptive pills in daily life, because it contains a large amount of progesterone, which may cause nausea, vomiting and other uncomfortable symptoms, and in serious cases, it may lead to irregular menstruation, early amenorrhea and other problems. It is recommended to observe whether there is any abdominal pain, dizziness, nausea, vaginal bleeding, etc. after using emergency contraceptive pills. If there is any abnormality, consult a doctor promptly to avoid delay.