Retreating bleeding after taking emergency contraceptive pills does not necessarily mean that the contraceptive is successful, and not everyone who takes emergency contraceptive pills will have retreating bleeding, and retreating bleeding is not a diagnostic criterion for successful contraception.
Emergency contraceptive pills belong to the high progesterone class of drugs, take after stopping, usually about 3 to 10 days will produce withdrawal bleeding phenomenon. If it is only a small amount of bleeding, it does not affect the implantation of the pregnant egg. Therefore, the withdrawal bleeding does not mean that the contraception is successful.
Some women do not have withdrawal bleeding after taking the emergency contraceptive pill, but it is normal for them to have a normal menstrual period.
Regardless of whether or not there is withdrawal bleeding after taking the pill, if the menstrual period is delayed for more than 7 days, it is recommended to go to the hospital in time, complete the relevant examinations, and rule out the possibility of pregnancy under the guidance of a professional doctor to avoid unwanted pregnancy.