If those lines aren't showing up until outside the testing time limit, those are evaps. Those stupid blue dye tests are notorious for getting nice pretty lines after the 10 minute time limit as they dry, also taking them out of the case for any reason speeds up this process as it forces them to dry faster.
Not to be the downer on your thread hun, just wouldn't want you being disappointed if that's what's happening.
Hopefully your frer will be positive! GL!