Sooo Ive seen lots of people mention shining a torch light behind tests to show up vvvvf lines.. But does this just show up the evap line or would it be a faint line.. I did this with my first response test (pic below) in the time frame and it showed a faint pink line with the torch but nothing without...anyone help I'm driving myself crazy testing.. We've not bd for 3 weeks but I have 6 week cycles and got a brown bleed on the 15th.. So I'm assuming it should show by now if I am :(