Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice.
As per your history, brown or black blood may be blood collected in last menstrual cycle, so it's normal, nothing to worry. For excessive bleeding you can take tab. Tranexamic Acid after consultation with gynecologist. Take care.
Hope I have answered your query. Let me know if I can assist you further.
Dr. Shyam B. Kale
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