Pregnant?

A few days ago I noticed some light blood when I wiped. Even though my period was not for another 7-8 days. Thinking maybe it was early I put in a tampon. Upon taking it out there was only some brownish blood, not much at all. After That there was no more bleeding. I have noticed some nausea and breathe tenderness. And took a test today (4 days before period) and got an extremely faint positive. Almost made me unsure I was seeing it, which made me think it may be an evaporation line. Has anyone else had extremely faint positive and been pregnant?