TTC and on one of our last options

My fiance and I are trying to conceive. I have been off depovera for two years now. My mentral is still irregular but I remain hopeful we will conceive soon. Ok my question is for those that have resulted to taking medication to help conceive. My physician recently prescribed me Metformin and I just had a few questions that I wanted to ask from "real women TTC". Have anyone heard about the drug metformin? Is it a good drug to take if trying? If so tell me why. If not, can I get a suggestion for one that is. Thanks