Is it possible to not ovulate??

Is it possible to not ovulate even if you’ve had no prior issues with ovulation? I’ve gotten ewcm for the past two days but negative clearblue ovulation tests. I have a very on schedule 28 day cycle, and I’ve had two periods since my MC and have followed my levels down to 0 so I’m not sure why this would be happening. Feeling super discouraged and could use some advice!