If you have already had a period after taking the pill, you will not get pregnant again. So taking birth control pills only works as contraception for that month, for example, taking short-acting birth control pills, such as Yosmin and Momoflower, which need to be taken orally from the fifth day of menstruation for twenty-one days, to prevent pregnancy for one month. If you take the emergency contraceptive pill, it will only work for the sex life before taking the pill. Therefore, no matter emergency contraceptive pill, long acting contraceptive pill or short acting contraceptive pill, after taking it, you have already had a normal menstruation, you will not get pregnant again. It is also recommended that if the patient takes short-acting contraceptive pills regularly, it may cause liver and kidney function damage, and it is recommended that regular checkups be given in the hospital. It is not recommended to use emergency contraceptive pills as a regular contraceptive method, and it is better to use intrauterine device or wear condom for contraception.