I had two god awful evaps on FRERS! Mainly because I opened them all up and your most likely to get an evap doing that.
However, my FMU samples were awful, I got next to no line with my morning samples because I drink a lot at night Id leave it a day or so and try again.
Or try a more sensitive test - I used the superdrug sensitive which was 10mui.
Good luck, looking positive!
xxxx