Opk and glow app

Nikki

Ok so according to this app, I’ve ovulated today however,according to my Clearblue fertility monitor, No LH surge has been detected. Last month the monitor didn’t detect my surge either so I used one of the smiley face opk’s and that’s how I caught the surge. Is this fertility monitor even useful?? Anyone else have issues with this digital monitor cuz I’m ready to throw it away!!!!