Having cycles but not ovulating🤔🤔🤔

I've been TTC for 6 months but I'm realizing that this may be my third month of no ovulation as the last two I didn't. Both of my calendars said I would've ovulated Saturday but OPKs were negative so Glow moved my ovulation day to today and I'm still not ovulating. I feel like I'm getting a yeast infection though and idk what from😩😩 this has also happened before once around the time I'm supposed to ovulate. Anywho, I'm very in tune with my body and ovulation and I used to know exactly when I would be ovulating and didn't need a kit. Question is, has anybody had cycles but didn't ovulate??? What causes this??