I agree, blue dye tests, in general, are extremely frustrating. If you use a regular Clear Blue test (non-digital), a faint line doesn't necessarily mean you're pregnant. I know that they'll say it does but I've taken blue dyes tests before that developed a faint second line and I wasn't pregnant. I'm going to assume that this is what happens on the digital CB's as well. Why exactly it happens, I don't know, but the rumor is that this brand also picks up other hormones in the body (besides pregnancy hormones) and that's why the faint second line appears even though you're not pregnant (and why they tell you NOT to take digital tests apart).