Metformin to regulate period?

❤ Sarah ❤

I've been diagnosed with PCOS for years, my new Dr put me on 500 mg of metformin to help regulate my periods in the beginning of June but since starting it my periods are more messed up than before. Last month was 10 days late, 12 days late (do far) this month. Anyone have similar stories? How long did it take to regulate your period?