There are two kinds of oral contraceptive drugs just after menstruation, one is more commonly used at present is emergency contraceptive drugs and one is short-acting contraceptive drugs. If you want to take emergency contraceptive pills orally, try to choose to take emergency contraceptive pills on an empty stomach or two hours after a meal, you can add a vitamin C to reduce the adverse effects of emergency contraceptive pills. At the same time, the emergency contraceptive pill is not 100% contraceptive, there is a 20% chance of failure, you can buy test strips about twelve days after intercourse to rule out the chance of pregnancy. Short-acting contraceptive pills are generally required to be taken orally between the first and fifth day of menstruation, just after the end of menstruation to regulate menstruation can be taken orally, one pill per day for twenty-one days or a box of drugs for twenty-eight days orally, it is also possible to stop the drug to menstruation, but as far as possible, orally between the first and fifth day of menstruation, so that a treatment cycle can be formed; In order to play a contraceptive role, it needs to be taken orally for seven days before the contraceptive effect is achieved, at this time it is not recommended to take it orally first can be taken orally again from the next cycle.