Clearblue digital also not only tests your LH but also your estrogen which with the digital tests, can give a more detectable window before your peak. Sometimes i got the blinking smiley face and other times, i would have the empty circle and then the solid smiley face.
Clearblue gives you 4 or more fertile days that is why . You will more than likely have 3 or 4 flashing days before its peak that’s what it was for me when I used Those