I got a positive result on Saturday morning, the water drew up the test and you could see straightaway where the line was going to be, I left it for 5 minutes and then checked it. It was all dried and there was a faint pink line. I got OH to look at it and he said yes there is a faint pink line.
I left it by the bathroom shelf and saw it about 10 hours later, the colour had faded a lot but you could see a line. I'm wondering now if that was an evaporation line.
bubhub I've just posted on another thread about the exact same thing. I did a first response on Saturday and got a very definate positive, only to do a CB today and get a line so faint I can hardly see it. AF was also due Friday and I was also wondering if pregnancy wasn't viable but think that just some tests are more sensitive than others maybe.
Thats what I'm hoping anyway. Hope it all works out for you.