Withdrawal bleeding does not mean pregnancy. Withdrawal bleeding is caused by taking certain medications that increase estrogen or progesterone or both hormones, and when the medication is stopped, the hormone levels drop, resulting in withdrawal bleeding. When the menstrual period is delayed for more than seven days, after taking a blood test to rule out pregnancy, and after taking progesterone, withdrawal bleeding occurs within three to seven days after stopping the medication. Or after taking emergency contraceptive pills: usually after taking emergency contraceptive pills, withdrawal bleeding will occur within three to ten days. If menstruation is delayed, it may indicate pregnancy, and you need to go to the hospital for a blood test of HCG to make a clear diagnosis. If there is any abnormality in menstruation, it is recommended to consult a doctor to clarify the cause and standardize the treatment.