Fasting can eat birth control pills, birth control pills are generally taken on an empty stomach or 2 hours after meals, emergency contraceptive pills can not be taken for more than 72 hours, the sooner the better to avoid exceeding the time leading to contraceptive failure. It is recommended to prepare for the pregnancy of women who are not ready to give birth, you can choose a condom to contraception, to avoid the side effects of oral contraceptives, oral contraceptives will generally appear after the menstrual cycle disorders, a small amount of vaginal bleeding, dizziness, nausea and other adverse reactions. Normally, we should develop good living habits, sleep on time, do not stay up late, maintain perineal hygiene and cleanliness, and prohibit sex during menstruation to avoid bacteria entering the pelvis and causing gynecological diseases.