Those tests have been cracked open, did you get a positive before opening? If not then they arent positive. Sorry if this sounds blunt but so many people believe you cant get an evap on a FRER but you can (and will) if you take them out of the case.
It's very hard to tell. If you are it's very early. Perhaps wait a week and test again. I would err on the side of leaving the tests intact; they aren't meant to be taken apart. Are you over due your period?