I always get 2 lines of OPK. Which is normal. I tested a few days back and got a med sort of faint test line on the day that the app said i should be more fertile( the app said 3days before peak ovulation was expected) and the next day got a faint line. The day after I tested again and got ONLY control line. Just 1 line. No faint test line. Just blank test line. Today I tested this morningish and tonight and both blank test line, as well. Is this OK? What could this mean? Should I be concerned?

This top pink test is from an hour or so ago and is OPK. The bottom blue test is HCG.