Is a evaporation line supposed to be colorless or can it have color

So last fri 11/14 I took a pregnancy test from the dollar store ( the one that brings a droplet) and it was with pink dye. My af was suppose to come on Sun 11/16 & nothing yet but anywho when I took the test I left it in the bathroom and went to the room and ended up fallin asleep the next morning I saw the second visible yet faint so please help me girls and tell me if its possible that im prego:) or that its just evap . Thanx xoxo