Taking emergency contraceptive pills twice in three days may lead to various side effects like nausea, vomiting, dizziness, etc., and seriously may also lead to the emergence of endocrine disorders, non-ovulation and other problems. The emergency contraceptive pill is a large dose of hormones, according to the regulations can only be taken once a month, not more than three times a year, if you have already eaten two times in three days, so there may be side effects, including gastrointestinal discomfort, such as nausea, vomiting, abdominal pain, etc., there will be breast swelling and pain, leukorrhea abnormalities. Endocrine disruption may also lead to delayed menstruation and lack of ovulation. Two emergency contraceptive pills in three days, it is recommended to take oral vitamins to reduce the side effects, if there is discomfort, first observation, any abnormalities in a timely manner to seek medical attention, eat a diet more light and nutritious food, two weeks after taking the pill with a pregnancy test to determine whether the urine test pregnancy, because the contraceptive pill is not infallible.