After taking birth control pills, bleeding after one week is Aunt Flo?

Patient's question:

After sexual intercourse, I took a birth control pill. One week later, I had a five-day period a week earlier than usual. I don't know if it's my period. Is it normal?

Doctor's answer:

After taking emergency contraception pills, there may be withdrawal bleeding. The main component of emergency contraception pills is hormones, and taking them may lead to withdrawal bleeding. If the amount of withdrawal bleeding is significant, it can be considered as one menstrual period, indicating successful contraception. Considering breastfeeding has been established, the five-day break in skin can be counted as one menstrual period, and the next expected period should be calculated based on this break.
It is recommended that emergency contraception pills have certain side effects, and it is generally advised to take them only once per menstrual cycle, with no more than three uses within a year.

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