After taking birth control pills, there is withdrawal bleeding. When will the next menstrual period come?

Patient's question:

No

Doctor's answer:

Used emergency contraception medication. After taking the medication, the next menstrual period should be calculated from the time of withdrawal bleeding. A delay or advancement of three to seven days is considered normal. It is recommended that you continue to wait. If the menstrual period has not arrived after more than ten days, you should go to the hospital for an ultrasound examination to check for pregnancy.