The low volume of menstruation after taking emergency contraceptive pills may be called “menstruation”, which is retreating bleeding or vaginal bleeding caused by the fertilization of egg, not normal menstruation; of course, it may also be normal menstruation, but the low volume is caused by endocrine disorder, so you can go to the hospital and the doctor will judge and give the corresponding treatment. 1. Bleeding: After taking the emergency contraceptive pill, the endometrium will be changed to a certain extent, and vaginal bleeding usually occurs in about 1 week, which is withdrawal bleeding, not menstruation, the patient does not need to care, observation can be done, usually about 3 days can disappear, pay attention to the pubic hygiene during the period; 2, fertilization of the egg: If the use of emergency contraceptive pill fails, resulting in the combination of sperm and egg, a small amount of bleeding will occur when the fertilization of the egg. Generally, no special treatment is needed, you can wait 2-3 weeks for ultrasound detection, if it is determined that the intrauterine pregnancy, the pregnant woman can keep the fetus or abortion; 3, the onset of menstruation: emergency contraceptive pills are composed of a high concentration of progesterone, after taking them, it is easy to make the female body hormone abnormal fluctuations, breaking the normal ovulation cycle, causing menstrual disorders, the symptoms of early menstruation, bleeding is small, the patient does not need to care The bleeding is small and the patient should not be concerned about it, but just observe it and it will return to normal in the next menstrual cycle. Emergency contraceptive pills can easily cause damage to a woman’s body, so if you do not intend to prepare for pregnancy, you should try to use condoms for contraception. If you have already taken the emergency contraceptive pill, you should pay attention to adjusting your diet and living habits to ensure adequate rest and balanced nutrition to reduce the damage of the drug to your body.