Taking emergency contraceptive pills when you’ve already ovulated generally works, but it’s impossible to generalize because of individual variability. Emergency contraceptive pills are medications used for emergency contraception within 72 hours of intercourse if contraception is not used during intercourse or if contraception fails. Emergency contraceptive pills contain a large amount of progesterone, which can inhibit ovulation, change the properties of cervical mucus, change the morphology and function of the endometrium, and change the function of the fallopian tubes, and so on, to play a contraceptive effect. So even if ovulation has occurred, taking emergency contraceptive pills may still be useful, but there is also a risk of contraceptive failure. And it should be noted that because emergency contraceptive pills are more harmful to women’s bodies, it is best to take the drug no more than three times a year to avoid damaging your health. It is recommended to take scientific and reasonable contraceptive measures during sex. After taking the emergency contraceptive pill, if the patient’s body has abnormal symptoms, it is recommended to go to the regular hospital in a timely manner.