Does bleeding for ten days after taking birth control pills mean successful contraception?

Patient's question:

The doctor asked you, "I haven't had my period for 7 days now. I took a test and it showed one line, but I'm experiencing symptoms of my period, like some abdominal pain, though I can't be sure. I just want to know if I can rule out the possibility of pregnancy? My period started on September 21st, and after it ended on the 27th, we had intercourse. We did have intercourse, and afterward, I took emergency contraception. Five days later, on October 5th, I had another period, which lasted for 10 days. After that, we didn't have any more intercourse. Now, it's been 7 days since my last period, and the test still showed not pregnant. I want to know if bleeding for 10 days after taking emergency contraception counts as successful contraception? I'm currently feeling a bit uncomfortable in my stomach, as if my period is coming, and I'm wondering if this is normal? I'm seeking an answer, and I sincerely ask for a responsible doctor to help me. Here, I want to genuinely say thank you to you."

Doctor's answer:

Based on your detailed description, the menstrual bleeding on October 5th was caused by taking emergency contraception, which led to withdrawal bleeding. If withdrawal bleeding occurs again, it is generally considered that contraception was successful; moreover, the test strip showed no pregnancy, indicating a low likelihood of conception.
It is recommended that withdrawal bleeding is equivalent to having a menstrual period. The next period should follow the new cycle. For example, if it is expected around November 5th, it would be considered normal.

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