faint line first response after the 3 mins

right so I was due yesterday for my period one done 3 clear blue tests all had very faint lines but I read that could be evaporating lines with blue dye so I went out got a first response I did test and waited it wasn't until around just after 5/10 mins I had the faintest line with pink and its got slight darker this morning I was really happy after reading you can't get faint line with first response and be pink so anyway i decided to do a test with water last night to see if any evaporation line came uo so I can rule that out and the test with water has a line with pink same as my test now I feel really down and like it must be a evap line !! anyone had a this and been pregame