Whether or not the contraceptive pill is still useful, depends on what kind of contraceptive pill is taken, such as short-acting contraceptive pills according to the doctor’s instructions to take correctly, the contraceptive pill is still useful to take after intercourse, emergency contraceptive pills may not be useful to take after intercourse. There are many types of contraceptive pills, and different contraceptive pills are taken in different ways, and the duration of their effects is different. Taking short-acting contraceptives, such as ethinyl estradiol cyproterone tablets, continuous use of a week after the contraceptive effect, contraceptive pills to eat and then coitus is useful, coitus is less likely to be pregnant. Taking is emergency contraceptive pills, such as levonorgestrel tablets, is a remedy for contraceptive failure after coitus, only one unprotected coitus before taking the drug is effective, after taking the drug again coitus, basically no great contraceptive effect, may be accidentally pregnant. Women need to know how to take the pill and when it works in order to increase the success rate of contraception.