Has anyone been in Metformin for PCOS? I started five or six weeks ago. My problem wasn't that I didn't have periods, it was that they were light and because I'm TTC I knew I wasn't ovulating from LH strips etc. I felt I did ovulate last month (only a few weeks into metformin so probably unrelated), my period came as usual. Whilst my cycles are long they are quite regular (34 day cycles), this month I am six days overdue a period so day 40 and my breasts have been swollen since the week before my period was due. I seem to be stuck in the 'week before period symptoms' phase. Anyone had this issue?