You can do it after taking the pill, but if you do it again, you must take contraceptive measures, never use the emergency contraceptive pill again to prevent pregnancy, the best method is to use condoms. Since the emergency contraceptive pill eaten, only have a protective effect on the sex that happened before, no protection for the sex that happens after. This contraceptive pill contains large doses of progestin, which mainly inhibits ovulation. If a woman has already ovulated at this time, it can interfere with the fertilization of the egg and inhibit the activity of the sperm, so it is only protective for the previous sexual intercourse. In addition, it is best not to take this drug more than three times a year, and preferably not more than twice a month, otherwise it will affect the effectiveness of contraception.