My body is weird

I had sore breast since 4 dpo... I was nausea and light headed .. then yesterday I started bleeding but it's very very light . I had a pad on for 3 hours. It was a quatersize blood in it . I'm not cramping and breast are no longer sore . But still have the blood there when I wipe ... I took a pregnancy test today negative. .. period due on 31

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