I'd ask your dr. I was on metformin when pregnant. The drs got into real trouble. As they put me on a fast, incase they had to deliver, then gave me my metformin dose and I was really ill, the metformin caused my already low blood sugars to dive and I was rushed to theatre for delivery
I have pcos, diagnosed with it when i was 10.
I came off metformin years ago as i suffered from bad side affects to it, the doctor didn't even suggest going back on it when he signed my medical forms for this diet! x