Clear Blue Ovulation

Has anyone used clear blue digital ovulation? I'm not sure if I fully understand it? On the 1st I had a blank circle on the 2nd I had a flashing face and now on th 4th it's now a blank circle? Does this mean only on the 2nd I was ovulation?! Or does it mean I have to wait for the solid face? Hoping someone who has had experience with this will help me out? Thankyou 💕💞