What is the reason for menstruation coming earlier after taking birth control pills?

Patient's question:

On December 16th, I took birth control pills. On January 31st, my period came, which was 4 days earlier than usual. On the fourth day of my period, I had a yellowish liquid discharge. On December 30th, I took a test and it showed one line. I asked what could be the reason.

Doctor's answer:

According to your description, you experienced your period coming earlier after taking emergency contraception pills, which is a side effect of emergency contraception. Taking emergency contraception pills may cause menstrual irregularities, such as coming earlier or being delayed. It is recommended that you wait and see first. Usually, it will return to normal after a few months. In the future, be cautious and use reliable contraception methods during sexual activity to prevent accidental pregnancy. The side effects of emergency contraception pills are significant, and they should not be taken frequently.

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