Help help help possible BFP

Lauren • Expecting baby #1 💙💗 February 2016
Okay ladies...I have questions please help me answer! 
1) I hear blue dye test ALWAYS show positive regardless if you are or not- any thoughts?
2) why is the up and down line in the first window so thin? Is this a bad sign?
3) I have a brownish discharge when I wipe, not a lot though. I'm 2 days late on my period.