I started using opks this month to see where I'm at in my cycle.  Glow estimated that I would be ovulating today, and ovia estimated last week so when I started using them and saw absolutely nothing on the strip but the test line for the past week, I thought I for sure wasn't ovulating yet and my LH levels were much too low to register on these tests at all.  My temps have been all over the place this month but steadily dropping by .2 degrees F for the past four days.  I know it's really hard to see in these pics because my hands were shaking but it's (super lightly) there.  Not a positive pregnancy test (definitely not positive for O either) but I'm really excited nonetheless!