What is this, irregular menstruation or some other illness?

Patient's question:

Hello! I am a patient who has been troubled by menstrual irregularity (this is the diagnosis from the doctor). Below, I will describe my situation and would greatly appreciate it if you could reply as soon as possible.
Vaginal bleeding record: (Only stopped for 7 days in the period between 11/8 and 12/26)
11/8~11/16 (Normal menstruation) 11/19~11/26 (Same amount as normal menstruation) 12/2~12/26 (Light flow)
Medical records:
11/20 saw a Western medicine doctor, had an ultrasound and blood tests, which showed no abnormalities. Diagnosed with menstrual irregularity and prescribed medication.

Doctor's answer:

How old are you? Have you ruled out uterine fibroids?

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