positive pg test or evaporation line?

I took a hpt 2 days ago which resulted in a very faint line after about 4 minutes. The line is a little more darker pink than the control line, but still is faint. I just cant tell is its an evaporation line or not. So i tested again this morning with my first pee, and now its negative. My periods are messed up so its hard to go by that, but a week ago i had a lot of white discharge , more than normal, so thats what made me decide to take a test. i know i should probably see a Dr. but wondered if anyone else had this problem??