The probability of getting pregnant on the pill is about 5%, but you need to take the pill regularly. This is because the effectiveness of the pill can be up to 95% or more, or even up to 99%. If you do not take the pill as prescribed and in the right amount, the contraceptive effect is very low and conception can easily occur, and the probability of conception can be as high as about 50%. The main contraceptive drugs are long-acting contraceptive drugs, short-acting contraceptive drugs and emergency contraceptive drugs. In general, it is not recommended to use emergency contraceptive drugs routinely, because the hormonal content of emergency contraceptive drugs is very high, which can easily lead to adverse reactions, especially menstrual disorders and certain gastrointestinal discomfort. It needs to be taken within a certain period of time, and exceeding the time will lead to the failure of contraception.