Are herbal remedies or natural products safe when I am pregnant?

Not always. They can have side effects/drug interactions just like any other medicine. Many of these products have not been standardized, so the same "dose" of one brand, may not be the same "dose" of another. Almost everything you eat/drink/breath will cross the placenta...So baby is having it too. Check with your doc. Many herbs/nat prods are great, just be judicious about how/when you use them.
Herbal Products. A lot of herbal products have not been tested for safety so you have to do some research of your own because a lot of docs are not up on herbs.