It's only cycle 1 TTC but I have become a deranged tester! Did this Clear Blue Early Detection test, thought was BFN so chucked in the bathroom bin. Was emptying the bin later and looked at it and am sure I can see a line.. I know it could be an evap as I read after 10 mins - also difficult to tell if it's coloured or not but in real life you can see blue pigment right on the edge of the window. AF due today according to Ovia (been tracking since Aug but had Mirena removed start of December) but test done 2 days ago. Positive OPK on 20th Dec. 
