Why do you get dark brown discharge after taking emergency contraception?

Patient's question:

Recently, there have been quite a few dark brown secretions in the vagina (which should not be leukorrhea), and there is also a frequent sensation of itching. It's similar to menstruation—more discharge is produced the more active one is, but it's actually about ten days before the period.
I'm very worried. Could you please tell me what the problem might be?
(Note: About four or five days before this symptom appeared, I took emergency contraception orally. Is there any correlation?)
Thank you very much for your answer!

Doctor's answer:

You should be experiencing side effects from taking birth control pills. The side effects of birth control pills include irregular menstruation, breakthrough bleeding, and amenorrhea, among others. Emergency contraception is a progestin-based birth control pill. Progestin can thicken the endometrium. When the effect of the medication wears off, the endometrium loses support, leading to withdrawal bleeding. Rest and maintain good hygiene. Pay attention to observe that withdrawal bleeding will occur in these days. If the bleeding is of menstrual volume, it indicates that contraception has been successful. You can also consider this bleeding as a menstrual period.

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