There is nothing wrong with using your favorite shampoo to wash your hair when you are pregnant. However, it is important to know all about pregnancy safe shampoos, because you will want to use products that are not laden with harsh chemicals. Shampoos can contain many chemicals that can, in a long run, harm you and the baby. And irrespective of how often you wash your hair or how long you let the products rest on your hair, some chemicals can actually cause health problems. Hence, it is advised to use natural, plant-based products that use as few chemicals as possible when you are pregnant.