I have heard you can't eat pepperoni when pregnant because of the chance of listeria, if i heat the pepperoni up in the microwave is this then safe?

Un-dried foods worse: Listeria prefers unsalted foods such as deli turkey. Pepperoni and salami are actually better alternatives! even so, actual infection from listeria happens only in about 5 people per million, 100 pregnant women per million (one in 10, 000), per year. So it's low risk. This includes cases caused by home prepared food left too long in the fridge--a higher risk, in general, than in a clean deli.

Usually - yes: Wash your hands after you handle hot dogs. Avoid cross-contaminating fluid from hot dogs packages with utensils or food prep surfaces. Ensure that hot dogs or luncheon meats you eat have been reheated to the point that they are steaming hot. Avoid soft cheeses blue-veined cheeses; and mexican-style cheeses. Avoid eating refrigerated pâtés and meat spreads. Canned or shelf-stable pâtäs and meat.