Minor concern

Hello po. I am in worry po. I had slight bleeding on Jan 9 onwards, it showed red blood. It lasted for a week, yet it came earlier than expected. By the end of the week, it lessened, but it hasn't stopped fully for days. I saw brown discharges, and it's normal. It stopped after a couple of days of releasing brown discharge. For a night, then the discharge came back first as brown for minimal, then turned darker (nights ago) minimal and increasing, dark brown to black. Rn, the blood I release is very dark and liquidy, compacted. What's wrong po? I attempted a pt, after the slight brown discharge, showed negative. Even my left breast hurts a lot. I experience heavy headaches. I believe, it's just a period. Maraming salamat!