What is the reason for bleeding after taking birth control pills?

Patient's question:

Normally, menstruation occurs on the 12th, on the 26th, I took birth control pills, and my period came on the 2nd, with a relatively small amount. On the 13th, I had my period again, still with a small amount, and I also took a test but it was negative. Is this a normal reaction to birth control pills? I am very worried. The assistance I need: Is it normal to have spotting after taking birth control pills?

Doctor's answer:

The consideration is that there is withdrawal bleeding, and the bleeding time after stopping medication is generally within one week. If vaginal bleeding reoccurs, taking emergency contraception pills and experiencing breakthrough bleeding is a relatively common occurrence. This is a phenomenon that does not indicate the success of breastfeeding. In reality, this breakthrough bleeding is generally not reliable as a menstrual period. If the bleeding volume is equal to a menstrual period, it can be considered as one menstrual period. After the breakthrough bleeding subsides, conventional breastfeeding methods should be immediately resumed. If the bleeding volume is very minimal, no intervention is necessary, but breastfeeding should still be continued until the next menstrual period. Emergency contraception pills have a significant impact on menstruation. The bleeding occurring now is not a menstrual period but rather irregular breakthrough bleeding caused by hormonal fluctuations in the body. It can be left unattended, and it may resolve within one or two menstrual cycles. If it does not improve, medication may be needed to regulate the cycle.

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