Nat- I still think you are pregnant too. Lighter lines happened to me the day after my first positive test, and that freaked me out. For some reason, I kept testing for a few weeks after I got my first BFP (which everyone told me was stupid) and at about 6 weeks, I got super faint lines on a test- way lighter than the others. I freaked out totally until I noticed that the level of dye in that particular test was way less than others I had taken, and that was why it was showing up lighter. From batch to batch and test to test, they can all vary which is why you shouldn't be necessarily panicking just yet. If you think back to when I got my first positive test, I refused to believe it for ages- I wouldn't even change my ticker, remember? And what you said to me when I was worried about AF showing up was that 'a positive test is a positive test, no matter when AF is due'. If you feel better just leaving it for a day or two and seeing what happens, then I don't blame you. But maybe after that, try with a Digi or a FRER? I'm still trying to upload this damn photo of my tests but it keeps saying 'invalid file' for some reason. If you want, I can send you a MMS with the pic? DM me if you do.
P.S. I realise that I sound like I'm nagging- I'm not, honestly!