App says I'm ovulating, but don't see it

I'm heading into my late 30s and trying for baby #2.. it's been 16 years since my last pregnancy and well this whole TTC thing is kind of stressful. This is my 4th month trying, I know not very long compared to some... but wanted some advices if I'm using these things correctly. Started testing the last day of AF. Almost everyday excluding 2/18 come out the same with no change in the lines.  My period is supposed to start in 9 days.  I have 20-22 day cycles. Although today came out pretty dark, pretty fast. What y'all think?? 😜😝🖖