Does taking prenatal vitamins increase yout chancrs of grtting pregnant?

Not likely. In the United States, a woman of childbearing age and in normal health is unlikely to have any significant vitamin deficiency that would decrease her fertility. However, taking prenatal vitamins once a day is fine. It is a way of being sure one gets the needed vitamins in case one's diet is not varied or balanced enough. The folate (folic acid) in the vitamins helps prevent some birth defects, too.