So this is my first time using opk's. I bought the clear blue digital advanced. Since I am slightly irregular, 30-37 days every month is different, I thought I'd start using them when my green week started on glow to see how accurate it was. The first 2 days I got a negative. And for the next 5 days, including today, I get the flashing smiley face. Which has left me scratching my head. In April I had the CD 5 & CD 21 blood work done & everything came back normal. Now I don't know what to think. Has anyone experienced this? Any help / insight would be much appreciated 😊