What is the reason for having blood for several days after taking birth control pills?

Patient's question:

I have a colleague who has been taking emergency contraception for several days, but she is still bleeding. She asked me, but I'm not very clear about what's going on.

Doctor's answer:

Contraceptives generally refer to female contraception, mainly composed of a combination of estrogen and progesterone. There are also monophasic progesterone and many non-steroidal drugs. Contraceptives can interfere with different parts of the perinatal process to achieve the purpose of preventing pregnancy. Your condition is considered to be caused by the breakdown of the skin due to taking emergency oral contraceptives. This is a side effect of oral contraceptives. Don't worry too much. However, it is also possible to delay menopause. It is recommended that you wait and see for the time being. Side effects usually completely disappear within 5-7 days. You should take contraceptive measures in daily life.

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