Ok I've just come in to work and I am manning the office on my own. It seems there are builders on the roof plastic coating it and the fumes are really bad in the office. I have just asked the builder if it is ok to inhale the fumes if i'm pregnant and he said there fine but i'm not sure?! No one work related knows I'm pregnant so I'm not sure what I should say? Should I be worried and make some excuse to leave or should the fumes be ok?