Metiformin success?

Alicia • Married: 02/06/2015 and TTC since: 03/10/2015 for #1
I have irregular periods and presumably unavulatory cycles. My gyno decided to first put me on provera (progesterone) auto attempt to regulate my cycles. She said to come back in 4 to 6 months if my cycles haven't regulated and I haven't gotten pregnant and she would put me on metiformin, just wondering what kind of success people have had with it. Thank you!