Honestly it's best to take those tests out of the case. If there's something faint there you won't see it in the case because it's too small, many of them are scratched or smudged, too far over to one side and they're too shiny. I thought many of mine were negative until I took them out and could see a line clear as day. Take it out and have a look, they also have a habit of darkening up after a while if there's a line on them