How Long Should I Take Benforce-M(Metformin) To Treat PCOD?

Hi, Iam 27 years old and married. My periods are stopped 2 years back. and in the test i came know that i hace PCOD. iam taking Benforce-M(metformin) tablets suggested by doctor. My question is like after this can this problem will be solved or am i need to continue this for lifetime as a insulin. am i have a chance of pregnancy or not?