The effect of oral contraceptive drugs beyond 72 hours is not much, because emergency contraceptive drugs need to be taken orally within 72 hours in order to play a contraceptive effect. If you take it for more than 72 hours, it will not be very effective, and it may cause certain adverse reactions or the effect of contraception will be greatly reduced. 80% of the contraceptive effect itself may be only 30% or 40%, which is generally not very effective. After taking emergency contraceptive medication orally, you should buy an early pregnancy test as soon as possible after 12 days of intercourse to rule out the possibility of conception, because it is not 100% contraceptive, and there will be certain adverse reactions, which may cause early or delayed menstruation, and there may be abnormal bleeding. However, the above-mentioned adverse reactions do not mean that they will happen to everyone, and if they occur, it is recommended not to panic too much, as long as the bleeding does not exceed 7 days, there is no big problem.