I started getting normal periods every 28 days since June of last year, I went on the bc patch in October 2015, I went off it in April 2016 after my period ended and I haven't gotten a period since. I was recently diagnosed diabetic so my doc put me on Metformin in mid May and I still have no period. I have been nauseous and tired and according to my calendar I should be ovulating right now which makes sense considering my breasts are hurting. I have had sex with condoms since going off. I'm heavy and was diagnosed several years ago with pcos but my body regulated itself with no medication. I took one test at my gyno office and it was negative. Can the combination of going off bc and getting on medication have affected my cycle?