Positive? Or evaporation line?

I had a baby girl almost 3 months ago. I've had 2 periods since then. 6 days alot started having alot of mucus. At first it was just very light pink and white mucus. Pink was barely noticable. That happend for 2 days. I even had a little green mucus and then it turned brown mucus for 2 more days. These last 2 days they have been a mixture of brown, pink and red. Not enough for a tampons worth just smears. Normally my periods start out pink and go to bright red and alot of it. I took a cheap pregnancy test a day ago. I'm not due to start my period for another 5 days. Its driving me crazy