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

Patient's question:

Symptom Description: My girlfriend took Jintyinting, and her menstruation only came for one day, with a little blood flow and then it stopped. What could be the reason for this? Medical History and Treatment Effects: She has never taken Jintyinting before. What kind of help do you want: Doctor please help analyze

Doctor's answer:

Hello, this situation is usually a manifestation of side effects, and it is also related to a person's physique. Because birth control pills contain hormones, some people may experience certain side effects after taking them. For example, irregular bleeding. This is often caused by incorrect dosage, medication quality issues, and individual physique, among other reasons.
Recommendation: If the bleeding is mild, there is no need to worry; it will gradually return to normal. If the bleeding is heavy, it is best to go to the hospital for examination and treatment. Additionally, it is important to get plenty of rest and avoid overexertion to prevent worsening the condition. I hope this is helpful to you.