Has metformin worked for you?

I have been diagnosed with PCOS when I was a teenager (29 now). I have always been thin but my cycles are basically non existent. My doctor put me on metformin about a month and a half ago but unfortunately nothing is happening. No periods, no ovulation. I use opks everyday and they all come back negative. Is it supposed to take this long to start working? My husband and I have been trying for our first for 7 months now. There's nothing more discouraging than those negative ovulation test every day. 😔