Ovulation confusion 🤷🏻‍♀️

My cycle is approx 30-32days however this month I am using clear blue digital ovulation test.

Initially on line calculations said today I should of ovulated however I haven’t had a smiley face yet. When I have entered that online it has now said I will ovulate on Saturday, Can some one explain how today is supposed be the highest chance of getting pregnant if I haven’t yet ovulated Ty