I am pregnant and my son just got the diagnosis of walking pneumonia. Should I be worried for myself?

Unlikely to be pbm. Your son's pneumonia is likely caused by germs from his own airway that settled into his lungs. Most are not particularly contagious. (but practice regular hand washing) your fetus is relatively insulated against simple illnesses you might catch unless it has a blood phase like a flu where it could pass to the infant via the placenta. Your catching a pneumonia would not automatically hurt baby.