The reason unpasteurized juices aren't safe during pregnancy is because it's never guaranteed that fruits/veggies were washed safely prior to juicing, and that the equipment used for juicing was sanitized properly. Unpasteurized juices can carry bacteria or parasites such as salmonella or E.Coli, all of which can be very harmful during pregnancy. Whereas, juicing at home should be fine as long as fruits/veggies are washed thoroughly and equipment has been sanitized properly. Remember to consume the juice instantly once collected, and not over a period of several hours or days.