If you take two emergency contraceptive pills in three days, it will definitely have an effect and the effect is very great, because emergency contraceptive pills can be taken twice a year at most in the clinic, and if you take two pills in three days, it may cause endocrine disruption. It can cause endocrine disruption, leading to irregular menstruation or disruption of the menstrual cycle. The main reason is that emergency contraceptive pills can prevent ovulation, breaking the natural ovulation pattern of the ovaries and causing endocrine disruption, so the impact is very great. In this case, if there are corresponding symptoms, such as irregular menstruation or frequent menstruation, it is recommended to go to the hospital to give appropriate treatment and correct the abnormal phenomenon as soon as possible, so as to help the body to recover as soon as possible.