trying to hold on to hope

Af isn't due til Friday/Saturday the past two days have just been drained and bloated. Felt some pinching like feeling and constipated sorry tmi for this part but tonight before bed went to the bathroom and when I wiped had a brown mucus when I wiped it was no bigger than my pinky nail. I tested two days ago but negative I'm sure just to early. Any of my cycles never had the brown mucus like substance. Could it possibly be my rainbow baby implanting ?