The left continues its war on women:
What are prenatal vitamins?
Eating a healthy diet is always a wise idea — especially during pregnancy. It’s a good idea during pregnancy to take a prenatal vitamin to help cover any nutritional gaps in the mother’s diet.
Prenatal vitamins contain many vitamins and minerals. Their folic acid, iron, and calcium are especially important.
http://www.webmd.com/baby/guide/prenatal-vitamins
After reading these arguments in various magazines I came to the conclusion that if you didn't eat a normal, healthy diet, vitamin supplements were good for you. So taking a multi-vitamin does no harm as far as I'm concerned and may act as nutritional insurance.