Is this normal with ovulation?

Today is CD 14, and I usually ovulate around CD 15-16. I’ve been taking opks and still haven’t gotten a positive, let alone a peak. I can usually see it begin to rise 1-2 days before peak (so around now). I also rarely get positives before the peak. It’s usually negative all the way up to the day of peak, then drops back to negative the following day. But while still negative, I can see the test line darkening (just not dark enough to be considered positive). But today I’m feeling my normal ovulation cramps. Is it possibly to ovulate without getting a positive opk? Or is it normal to get ovulation cramps a couple days before ovulation? I guess I’m just confused because I always get ovulation cramps, but it’s always the day of or following my peak opk. Advice or your own experiences are appreciated!