Possible faint line or Evap

I took this test with FMU and took another test with third morning urine (diluted) and nothing was on it. I'm starting to think it could be a dodgy test or Evap but it showed up within 10 minutes. I'm testing again with FMU but with a FRER tomorrow. (This was Forelife Ultra+ Early pregnancy test 10miu). I'm almost certain it will be negative as I've had all the usual AF symptoms. I'm 12dpo and I feel if I really was pregnant the line should be darker. AF was due today.