The only Vitamin anyone should be taking is a Whole Food Vitamin. If a vitamin is labeled natural don’t be fooled into believing it is derived from Whole Food, it may not be the case.
In early pregnancy smell, taste and thought aversions may make you nauseous and cause vomiting. This is normal. But it may not allow you to keep your expensive, healthy, absorbable food based vitamins down.
In that case you my have to resort to less then optimal supplement sources until you feel better and can keep water and food down. As you begin to feel better experiment with different ways to get your whole food vitamins to go down and stay down!
Note: Hyperemesis Gravidarum is a complication of pregnancy that is characterized by severe nausea and vomiting such that weight loss and dehydration occur. Signs and symptoms may include vomiting several times a day and feeling faint.