I would be wary of anyone suggesting the McDonald's burgers are transported around the country warm...that I have a VERY hard time believing. cooked off site, defiantely possible, but getting HACCP approval for longhaul warm transport is highly unlikely.

Most people dont think about it but rice and pasta are actually very high risk foods, pregnant or not, due to the water content. Bacteria are present and grow where ever there is water, so be careful especially when reheating rice.