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There are two types of surrogates, Gestational and Traditional. Both types are just as safe as traditional pregnancy but are very different. 

A Gestational Surrogate is the most common type of surrogacy.  A gestational surrogate carries a child that is not related to her in any way.   The embryo is usually created through the intended mother's egg and intended father's sperm using In Vitro Fertilization or IVF.  It is then transferred to the gestational surrogate, who acts as a human incubator, carrying the parent's baby through to birth.  Sometimes the mother's eggs or father's sperm cannot be used. In this case, a donor's egg or sperm is used, and this is called traditional surrogacy.