Yes I got pregnant on metformin. After trying over a year my doc started me on 500mg and I was supposed to work my way up to 1500mg. Once I got to 1000 it made me very sick so I went back to 500. This was for about a month. Along with this I started to exercise a little bit and went on the diabetic exchange diet. Im not diabetic but the doc noticed my insulin levels were bordering above normal and my glucose was okay. I still went to a nutritionist who got me on this diet. I took it very seriously and lost 19lbs. Prior to all this I didn't have normal cycles... Maybe every 90 days if I were lucky. I did opks and everything but was never successful. With dieting and metformin I must of got pregnant within a month and a week.
The only other thing that could have played a role is that I also got my tubes tested to see if there was blockage (SIS procedure). There was no blockage.. All my anatomy was okay.... Just pcos and irregular cycles. I'm now 33 weeks pregnant.
I truly believe that diet, exercise, and metformin did the trick. Prior to starting this, my doc mentioned that many people (who have no other known problems) often get pregnant within 3 months. I didn't believe her, but it happened!!!