Maca Root is actually not an herb, it is a vegetable from the radish family. I did some research on it under herbs and had a hard time finding anything on it until I just started googling Maca Root on its own. It is classified as a Starch Plant.
Here are some pictures of it from the growing fields.

The first website says you can take it throughout a pregnancy because it is a food, not an herb. I don't know enough about it to want to do that. It does seem to be a pretty safe food to eat, but once they put it in powder form and pill form, I am sure they add other things to it.

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