Best prenatal vitamin?

Julia
What is your favorite prenatal vitamins?
 I've been taking NatureMade Prenatal for about a year but it makes me extremely nauseous and over the last few months has started to make my teeth brown. 
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​I'm looking to try out another one with a recommendation, I just picked my current one off the shelf at Walgreens. 
​Would love to hear your thoughts on this girls!