Ovulation help

Dara

I was wondering if it’s possible to not ovulate during the month. I’ve been testing and I have not had a positive opk. Not even close. Now they are getting lighter. Is it the way that I’m testing? Or is it possible to not ovulate some months. I just started temping so I don’t have a lot of info on that. I have endometriosis and my husband I just started trying to get pregnant.