The duration of bleeding after a woman takes the pill depends on her body type and the type of medication she is taking, usually bleeding occurs about 3-7 days after stopping the pill. If the patient is taking a combination of short-acting contraceptives, most patients will have a period 2-3 days after stopping the pill, usually no more than 1 week. If you take the emergency contraceptive pill, you will usually experience vaginal bleeding for about 7 days. The main reason is that short-acting contraceptives contain highly effective progestin, which can lead to thickening of the endometrium, and after stopping the pill, the endometrium will shed and bleed, i.e. withdrawal bleeding. If you take emergency contraceptive pills, you may experience irregular menstruation because of the interference with ovarian function. If the bleeding is heavy and persistent after taking the pills, it is recommended that you seek medical attention as soon as possible. If the patient stops taking the pill for a week or even longer without vaginal bleeding, it is also necessary to go to the hospital to find out the cause of the problem and treat it promptly. It is also important to note that emergency contraceptive pills should not be used as a regular form of contraception, as they can cause harm to the body.