Is it safe for me to drink unpasteurized juices while pregnant?

No, not safe. No, it's not safe. Look here: http://www.Cdc.Gov/foodborne/juice_spotlight.Htm.
?pasturized juices? Pasteurization is a process that usually relates to milk where the milk is heated to kill germs. I've never heard of it applied to juices. I don't suggest unpasteurized milk due to a multitude of interesting germs that fine it a nice home. For juices, you have to use the common sense standard. If you are concerned about bacteria or contaminants, avoid it, if not, enjoy it.