What is the reason for the menstrual period coming 9 days earlier after taking emergency contraception?

Patient's question:

Hello, after taking emergency contraception, this period arrived 9 days earlier, and the amount was not much. The first day it was black with a little clots, now on the third day it's red.

Doctor's answer:

Based on the information you provided, it is speculated that emergency contraception contains hormone-based medications, and many people may experience irregular vaginal bleeding after taking it. Since this is the first time you have encountered this condition, you can wait and see. If your menstrual cycle and flow remain irregular next month, you should go to the hospital for an ultrasound to check the situation. Treatment can then be adjusted accordingly.

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