Everyone is getting sick...

I get 12 weeks (unpaid unless I use sick/vacation time) FMLA. I've got a c-section scheduled in the next couple weeks because of cholestasis and IUGR. Everyone at work is starting to get sick with coughs and, of course, are coming into work. All I keep thinking is that I'm going to get a gnarly cough right before I go on leave to have a baby cut out of me & I keep thinking "how am I going to be coughing if I've got a fresh wound through my muscles?!" Am I overreacting if I tell my work I'm willing to work from home but I'm not coming into the office? Or am I just being neurotic?