Taking 2 emergency contraceptive pills in 3 days has the potential for unintended pregnancy. The reason is that no matter how many emergency contraceptive pills are taken, they are not 100% effective and there is a chance of unwanted pregnancy. After taking emergency contraceptive pills, there is a 2%-4% chance of unintended pregnancy if the pills are used regularly, and the chance of unintended pregnancy is higher if the pills are not used regularly. Therefore, after taking emergency contraceptive pills twice in three days, if there is a delay in menstruation or to the menstrual period when there is a small amount of vaginal bleeding, abdominal pain and other abnormalities, it must be considered that there is a possibility of pregnancy, and you need to check the blood and urine HCG to make a judgment. In addition, emergency contraceptive pills are highly effective progestins, estrogens or mifepristone, and are not recommended as a regular contraceptive method. It is not recommended to be used as a regular contraceptive method because excessive use may cause endocrine disruption and menstrual disorders in women, which may easily affect their health.