3 apps later..

Melissa S

I have three period/<a href="https://play.google.com/store/apps/details?id=com.glow.android">ovulation apps</a> on my phone for just under a year and all three say today is my highest chance of getting pregnant. I took an clear blue ovulation test and it say 0 ( meaning nothing) not even peaking. I also took a test yesterday and it says 0. What does this mean? Is the test wrong/defect? Am I crazy. Any feedback would be very appreciated.