I've taken a test at 7dpo. Don't ask me why. I know it's crazy! And there is a very, very faint line and it looks pink, but I had this a couple of months back too at 12dpo and I wasn't pregnant (although I suspect it could have been a chemical as I also got a faint positive on a FRER) and last month at 15dpo and the line looked the same darkness each time. Are these tests just unreliable?