Has anyone ever used a clear blue fertility monitor?

Been TTC for one year (sigh) ... my period cycle is every 32-35 days. My friend used a clear blue <a href="https://play.google.com/store/apps/details?id=com.glow.android">fertility tracker</a> and got pregnant the first month after she’d tried for 2 years... so I’m gonna give it a whirl. I’ll keep you all posted.