Evap lines-help please

How can you tell?? I know bfps aren't allowed in this group, but I'm leaning towards evap because I don't want to get my hopes up.. I took a test and glanced at it about 5 mins later and left.. came home about 4hrs later and it looks positive.. so I have no idea when the line showed up. Input please!! I know I can test again as most would say but I need to ease my mind so I can sleep. Thanks ladies