Clear blue Digital OPK question

So I just started using the Clear Blue digital opk this month. 4 days ago I got the blank circle for low. Then for the past 3 days I have gotten the blinking smiley face.  I know this it good and my fertility is high but I thought it only predicted my 4 most fertile days. Should I get the solid smiley face tomorrow for peak fertility?? Just new to this so any help is appreciated!