I lean toward saying no, but I think it actually probably is. I had that exact same type of reading 2 days ago on CD10 and assumed it was negative because it's supposed to be equally dark or darker than control line. But since that day it's been getting lighter, so I think I probably o'd around CD10ish. It's probably safest to assume that it is positive and go ahead and BD. Then if you get a darker line a little later you'll know to BD again.