Ovulation?

I’m very confused.. CD 12 on femara (days 5-9). I got a very clear positive OPK yesterday and now my left ovary has dull pains. Not painful and unbearable like period cramps, but I notice they’re there. Also pain on my back on that side. I have never ovulated on my own so I am not sure how ovulation pains feel. Does this sound like ovulation?