8 days after ovulation - brown blood

Rose

AF isnt due for another 8 days. Lastnight had cramping in my lower abdominal area and this morning a small amount of brown blood. Still crampy atm.. Could I be getting AF early? Could this be implantation? Do I count this as a period and CD1? I did BD with a positive OPK, EWCM during ovulation but this was only 7 days ago.

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