Does taking birth control pills usually delay the menstrual period of the second month?

Patient's question:

I took emergency contraception, and the period in that month was delayed by 5 days compared to the normal date (the 12th), arriving on the 17th. What I want to know is, did taking the pill delay the period of the second month?

Doctor's answer:

After taking emergency oral contraceptive pills, a withdrawal bleeding usually occurs within one week, followed by a change in the menstrual cycle, which generally follows the pattern of withdrawal bleeding. From your situation, withdrawal bleeding is not mentioned, but your period is expected around the 17th. Therefore, this month's period should also be around the 17th, but it may also be later. If you have no risky sexual activity after November 17th, there is no need to worry, as you will definitely not get pregnant. However, the uterus will have a recovery period, which may cause the period to be delayed.

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