is it too good to be true??

I am only 4 days late of my period so I decided to do a few pregnancy tests yesterday. I did a blue dye one which I thought was faulty as 2 lines didn't show until about 3 minutes or more. I tried the first response brand twice yesterday as well and there were lines, but they were so faint. I did another in the morning today and results showed at the 2 minute mark.. Is this a positive of an evaporation line. (I will go to doctors today to get a blood test) I just wanted your opinions.