Are there any vitamins you shouldn't take when ttc/pregnant? if so which ones?

No, however...: Vitamins by definition are nutrients essential for good health. There are none you shouldn't take, in fact taking Folic Acid & biotin when trying to conceive is proven to reduce risk of birth defects. However, one should limit vit. A to no more than 10, 000 iu/day in the first 7 weeks of preg.-but some vit a is important.See http://www.Care2.Com/greenliving/is-vitamin-a-safe-for-pregnant-women.Html.