Does taking birth control pills cause your period to come earlier by so many days?

Patient's question:

Medical history and effectiveness: I had my period on September 30th. I took one birth control pill on October 5th, and then I had my period again on October 10th, but it was very light. I felt very tired.
What kind of help I need: Why is this happening? I just had my period not long ago, and it came back again. Is it because my body is weak?

Doctor's answer:

Hello, based on your situation, the vaginal bleeding that occurred again after taking emergency contraception is likely due to withdrawal bleeding, which is an adverse reaction of the emergency contraception medication, not caused by poor physical health.
Advice: Since you are not experiencing any discomfort in this case, there is no need to take action. Additionally, it is recommended to use condoms for contraception in the future to prevent the recurrence of withdrawal bleeding.

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