Metformin for PCOS?

I had the RNY 17 months ago and have lost 191 lbs. so far. Hubby and I are trying to conceive but I was just diagnosed with PCOS (probably undiagnosed earlier because OB/GYN's want to blame everything on weight, rather than the other way around). Anyway, now that I am in an acceptable weight range, I have found a great reproductive endocrinologist who put me on Metformin for my PCOS. He said Metformin produces regular cycles in 50% of previously irregular women. Has anyone else been prescribed Metformin for PCOS? Did it work? How long did it take before your cycles became regular?

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