Is it true that menstruation comes immediately after taking birth control pills?

Patient's question:

I always feel something is not quite right with my body. Does it mean I will get my period right after taking the birth control pill?

Doctor's answer:

Taking emergency contraception within 72 hours after sexual activity will never cause menstruation immediately. Generally, it takes 5 to 7 days to experience withdrawal bleeding again. The breakdown of the pill is a normal metabolic process, and it can also affect estrogen and progesterone levels in the body, leading to the next menstrual period coming earlier or later. These are all normal side effects of taking the pill and do not need to be worried about.

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