anyone taking metformin? how long did it take for you to get pregnant?

Star • Getting married march 2014 have 2 beautiful baby`s ttc 3rd. Ttc 17 months
I have a week and a half left to finish my first month of metformin. I just need to hear positive feed back about it even negative.. we've been TTC for 2yrs for our 3rd baby . its been an extreamly emotional journey. :(