Taking three emergency contraceptive pills in three months may cause a series of side effects such as endocrine disruption, changes in menstrual cycle and irregular vaginal bleeding. Emergency contraceptive pills generally work through a large number of progesterone or antagonistic progesterone, the body’s hormone levels have a greater impact on the endocrine disorders, menstrual cycle abnormalities; there may also be headache, fatigue, nausea, vomiting, post-pill spotting and bleeding, breast swelling and pain, and other side effects, these side effects usually disappear gradually after stopping. Emergency contraceptive pills should not be used more than three times a year and are not recommended to be taken routinely, but only as a temporary remedy. If you feel unwell after taking the pill, it is recommended that you seek prompt medical attention and symptomatic treatment under the guidance of a doctor to avoid delays in your condition.