High fertility then low

Cl

I could use some help in understanding why I had 2 high fertility days (clear blue advanced ovulation test) then on the 3rd day it went back to low fertility. I never got the symbol that I peaked? Did I miss it? Is my cycle off? But, I’m using this app and it says I won’t ovulate till the 4th.. but I had 2 high test then the next day low? I’m very confused! PLEASE HELP!