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

Patient's question:

Only took 3 pills of Mifeprex. Due to some reason, I stopped taking the medication. After that, my period came 11 days earlier. My breasts have been constantly sore. My period has lasted for 12 days and hasn't stopped yet. The blood is not normal and appears as a dark coffee color. What illness do I have, or is this a side effect of the medication?

Doctor's answer:

Hello, birth control pills can delay the next menstrual period due to their effects of inhibiting and delaying ovulation and suppressing the endometrium. Temporary use may also cause a temporary increase in hormone levels in the blood, followed by a decrease and subsequent withdrawal bleeding, which manifests as an early menstrual period. Its side effects may lead to symptoms similar to early pregnancy, vaginal bleeding, decreased menstrual flow or amenorrhea, endocrine disorders, weight gain, facial hyperpigmentation, infertility, or gastrointestinal discomfort, headaches, weight gain, nervousness, low mood, skin spots and acne, etc. Emergency contraception should not be used more than three times within a year, and only once per month. Otherwise, it may cause menstrual disorders, and severe cases may lead to amenorrhea. It is recommended to use other contraceptive methods in the future. You still need to wait and see, as the possibility of pregnancy is not very high.

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