If you're buying this to try to detect a pregnancy 5 days before your missed period, DON'T WASTE YOUR MONEY ON THIS! I took this test 5 days before my missed period, at which point the product claims to be 94% accurate. There was a second line, but it was SO FAINT my husband could barely see it, and I thought I might be making it up in my head because I wanted to be pregnant so badly. I did it again the next day (both of these were first urine of the day, when the HCG should be most concentrated) and got the same thing. The line was so faint I was convinced it was an evap line, or maybe an indent line. Today was the day I was supposed to get my period, so I took one last test using a cheaper brand just to be safe. Guess what? I'M PREGNANT! So I guess what I'm saying is if you do use this, and you see a second line that's so faint a camera can't even pick it up, you're probably pregnant! But you're better off just saving your money and waiting a few days longer to take a cheaper test!