Metformin

I have PCOS and was just put on Metformin to control the symptoms and get my cycles regular.After only a week of taking 500mg a day, I had my first period in over 3 months. However, no positive tests yet for ovulation :( anyone have any success stories from using Metformin? I'm really hoping this works, we've been trying for almost 3 years now. It gets discouraging after a while.