Evap or a faint line

Emma • married, mommy of two angel babies👼🏻👼🏻TTC
So I took a hot and fell asleep, woke up and saw a line. Because it was 2 hours later I decided that it's an evap. Tried to "wash it off" but the line is still there. I have to wait till tomorrow to get more tests and to do it with fmu. Can anyone tweak it? So that I see whether it has got colour maybe.
 Thanks in advance!!!!