Top two yes, though it is harder to tell accurately once the ink has dried and faded as IMO the test lines always darken further then. It is rare but you can get a positive opk and still not ovulate as the positive indicates your lutenising hormone is surging, which it needs to do just prior to ovulation, but it is not an indicator that ovulation will definitely happen, just that the body is preparing for it to happen imminently. But you can have the surge and still not ovulate for a variety of reasons.