PCOS AND NO CYSTS

Kayla
I just turned 26 and have one boy who is 2 1/2. Had a miscarriage September 2014. I have just been diagnosed with PCOS and not cysts on Monday this week. I have also started metformin 500mg on monday. How long has it taken peopke to get pregnant with just metformin? We have been trying for a little over a year (13 months).