Some Alfredo sauce in jars may contain uncooked yolk and other ingredients which may not be safe for a pregnant woman. So the key here is to not consume the sauce right out of the jar. You need to cook it with your pasta or other dishes to make sure that it is well cooked. Moreover, as these sauces are generally high in sodium and calories, these are not healthy for an expectant mother. You can consume but you cannot over-indulge.