Is it useful to take contraceptives after 24?

24 hours after taking contraceptives can play a certain contraceptive effect, but any kind of contraceptive method, its success rate is not 100%, so there is also the possibility of contraceptive failure. If menstruation is ten days later than usual, there may be pregnancy. In order to make a clear diagnosis, it is recommended to go to the hospital, take blood to check chorionic gonadotropin, make pelvic color ultrasound to make a clear diagnosis, and review if necessary. The side effects of emergency contraceptives are very large, common side effects are irregular vaginal bleeding, menstrual disorders, gastrointestinal reactions, etc., can only be used as a remedy for contraceptive failure, can not be used as a conventional contraceptive method.