Ovulation/OPK Question

After very weird cycles, I went to my doc and he prescribed Metformin which is supposed to shorten and regulate my cycles. After a 60 day cycle I finally started my period. Im on day 19 and have been using clearblue digital with the smiley faces so I can easily tell if I'm ovulating. Still nothing...I'm trying not to get frustrated but it's kind of hard! Any suggestions or similar stories??