It is not recommended to take birth control pills twice in a month because birth control pills are hormonal medications that can cause changes in endocrine hormones in the body, which can also cause menstrual irregularities. If the number of oral intake on the high side, then it will have an adverse reaction, causing early, delayed menstruation, and may even cause abnormal bleeding for a long time. At this time, as far as possible during coitus, take condoms for contraception. At this time has been the end of coitus, and worried about pregnancy, if and drug abortion and abortion compared to the damage is relatively small, contraceptive pills, can bear some risk, oral contraceptive pills once after the adverse reaction must be observed contraceptive effect. If there is an adverse reaction, go to the hospital in time for ultrasound, including endocrine hormone tests, if necessary, you can take oral short-acting contraceptive drugs to repair the lining and regulate menstruation.