What are the reasons for bleeding after taking birth control pills for a few days?

Patient's question:

5.19 my period just finished and I had sex with my boyfriend. Then on the third day, I took Shuting birth control pills. On 5.25 morning, I noticed some peeling. Hello doctor, what is going on?

Doctor's answer:

If you are using emergency contraception and experiencing breakthrough bleeding, consider the high levels of progesterone in the emergency contraception, which can cause the endometrium to shed and lead to breakthrough bleeding. This is also why our doctors do not recommend using emergency contraception, as the effectiveness of breastfeeding is not 100%. It is recommended to pay attention to rest and hygiene, and wait for one or two months for your menstrual cycle to gradually return to normal. The best option is to use an intrauterine device (IUD) for breastfeeding.
Individual patients may not be able to tolerate it, which can lead to menstrual disorders, irregular vaginal bleeding, dizziness, nausea, vomiting, and in some cases, amenorrhea. Some patients do not take the medication as prescribed or use it improperly. Contraceptives are hormones that affect the body.

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