Geritol and prenatal vitamins?

I've seen a lot about taking the geritol multi vitamin - "a baby in a bottle." But is it safe to take it and prenatal vitamins? They say geritol is high in iron which is good but my prenatal has 156% of my daily iron needs. So ... Would I have an "iron overload" by taking both? Or would I double my chances? I'm willing to try anything but I don't want to kill myself with too much iron or any other mineral.