Does emergency contraception cause irregular periods?

Patient's question:

Hello, I had an abortion on November 13, 2005. After the surgery, I felt fine, but I had sexual intercourse with my husband half a month later. However, I took emergency contraception afterward, and then took another dose of emergency contraception seven days later. According to my normal cycle, my period should have arrived around December 10, but it hasn't yet. I also took a pregnancy test and it was negative. Is this situation normal?

Doctor's answer:

The main impact of emergency contraception on menstruation is reflected in changes to the menstrual cycle, which may be advanced or delayed. Frequent repeated use can lead to menstrual disorders, bleeding, and prolonged spotting. Therefore, it should only be used as a backup measure and cannot replace regular contraception methods. Menstruation typically returns to normal within 2-3 months after stopping the medication. Subsequently, other contraception methods can be adopted.

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