Clearblue digital tests

How close to ovulation/peak did y'all see a smiley/high fertility result using the clearblue digital tests? My ovulation was predicted for aug 3 but I am still getting open circles on the clearblue test. Everyday I get a negative result my ovulation date is pushed back. I am currently cd12 and have a 26-27 day cycle. I started testing on cd10. Could I have missed my window for the high fertility results? Maybe I will go from open circle to peak results??