How long does the menstrual period delay when taking birth control pills?

Patient's question:

I took the birth control pill twice this month. It is said that taking birth control pills can affect menstruation. My period is now delayed by one week, and I don't know if this is a normal phenomenon. Could you please let me know how long the period is usually delayed?

Doctor's answer:

You have taken emergency contraception twice this month. The most common side effect of emergency contraception is an impact on menstruation, which may cause it to be delayed. Your period is already one week late. The first step is to use a pregnancy test to determine if you are pregnant, as emergency contraception does not have a 100% breastfeeding rate and there is a possibility of successful breastfeeding. If the urine test is negative, it means you are not pregnant, and you can focus on waiting for a few more days. It is difficult to predict how much longer the delay will be. If your period still hasn't arrived after two weeks, you should go to the hospital for a B examination and then try to induce menstruation.

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