I was seeing a reproductive endocrinologist who put me onto Metformin. She advised me at the time to stop taking it when I fell pregnant.

It's always best not to take anything unless you really have to.

She did tell me that while there didn't appear to be any problem with taking metformin during pregnancy, there was not a lot of research to fall back on. At the time there was nothing to suggest it was dangerous to use in early pregnancy.

If you were taking metformin for problems in addition to controlling insulin resistance and helping with ovulation, like diabetes or miscarriage, then it would be worth the risk.

Do whatever feels right for you until you get to see your specialist. I was closer to 7 weeks before I realised I was pregnant and stopped taking the met. My scans have not shown any problems with my baby, so looks like they can add me to the statistics for Metformin.

From what I hear, it's becoming quite a success.