Period apps not accurate

I truly do not believe these <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">period apps</a> really work. What do you all think?? I want to throw in the towel but I really want another baby I have taken my 1st round of Clomid nothing happened thinking of putting in the order for the second round.. just tired of the disappointment 🤦🏾‍♀️😫😩