Sorry
I'm really not being mean because I know how much you want this but just wanted to say that last cycle I had some asda and tesco tests do this to me... and from what I can see yours has done the same... if you really look its not so much a 'line' but rather the whole half of the test before the test line has stayed darker and thats when mine done when I was not pregnant. Its almost like the dye stays there and then eventually moves on after a while and so it fades.
I hope this is not the case for you and you get your BFP though! I didnt that cycle but did the next