I was told by my gynecologist that, even at the age of 48, my labs show that I am post-menopausal (I did several rounds of IUI/IVF treatment, unsuccessfully, to try to become pregnant in my mid-40s). She said that if I EVER experience vaginal bleeding, I should go straight to the doctor. I had some spotting today--Is it possible that Metformin (500mg BID begun about 4 months ago for insulin resistance syndrome) could be causing this spotting?