Is it normal for menstruation to come earlier after taking birth control pills?

Patient's question:

I had my period on November 25th, had sexual intercourse again on December 6th, and took emergency contraception on the 7th. On the 13th, I had another sexual encounter, and my period came before taking the medication. What could be the reason for this? Do I need treatment? Should I continue taking birth control pills?

Doctor's answer:

Hello! Your current menstruation is not a normal period but caused by the side effects of emergency contraception. Generally, it does not require resolution.
Advice: Emergency contraception is only effective for a single act of unprotected sex. It's unclear whether your period on January 25th was normal or if it occurred. I can't determine if your 13th was during your ovulation period. If it was, additional measures should be taken to prevent pregnancy.
I hope this helps.

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