I am a bit embarrassed to be posting this and need someone to tell me not to be so silly.
I have a load of internet cheapy tests and the last couple of days have been getting the faintest, faintest line you can imagine, just inside the time limit (well, ten minutes so stretching it slightly). I'm pretty sure they're evaporation lines, but when I dip a test in plain tap water nothing comes up at all (apart from the control line of course). I am sure there is a reason for this and I am NOT pregnant, especially because the lines have been the same faintness for the last three days (I'm now 12dpo).
Can anyone explain the tap water thing and at the same time tell me to accept they're negative? No need to be polite or beat around the bush here!