Is hot apple cider safe during pregnancy?

Only if it is pasteurized. Which means not from the cider mill. Some grocery stores sell pasteurized cider, but check the label to be sure. Eating or drinking unpasteurized foods can exposed the unborn baby to a bacteria called listeria (and other pathogens)and can cause miscarriage. Here's one website that gives examples of what not to eat: http://www.whattoexpect.com/pregnancy/photogallery/foods-to-avoid-during-pregnancy/8