Ovulation question... need answers


So yesterday I had an appointment with a fertility doctor (my first one) before we can do anything we had blood work done. They called me and told me not to take provera to induce my period because I ovulated about 2 weeks ago. I’m not sure how you can ovulate without a period. My last period ended the beginning of October (induced) and the one before that was December 2016. How can I ovulate? Plus been taking ovulation sticks since then and never showed that I was ovulating.