D.W.
Do you have PCOS or diabetes that the Glucophage (metformin is the generic) was prescribed?
Based upon the information I found on Drugs.com (http://www.drugs.com/cdi/provera.html), I'd recommend talking to a pharmacist to see what information they can find on using these drugs when trying to conceive. Provera, it appears, is not FDA approved during pregnancy and can be dangerous to the unborn child.
Metformin, on the other hand, is pregnancy category B (means the FDA does not believe the risk is greater than the benefit and doesn't believe there is harm to the fetus).
Also, what kind of doctor recommended this? OB/GYN or primary care? A physician's medical license allows them to prescribe products even for uses not approved by the FDA if there is a valid medical reason, but you may want to arm yourself with as much information as possible. Instead of the internet, I'd highly recommend asking your pharmacist to do a little digging for you.
My other favorite medical sites for information on medications are:
mayoclinic.com
www.fda.fov
www.drugs.com