YANBU.
Likely case in the class I teach at. Been swabbed and awaiting results. Child back at school, albeit still a bit sniffly and carrying horrid used tissues everywhere Parents not bothered to tell us though We only know because of the HSA calling school.
But I am still in there and going about normal work. OK, I have avoided too much close 1 to 1 with the child - she is very tactile. But what can you do?
Advice is that you go about your normal business unles you are ill.
You are not contagious unles you are displaying symptoms and in that case you stay home and call your GP.
Obviously I'd rather me, Dh and DD were not ill. But we are all healthy people and are upping out vitamin intake to ensure we are, which means it should not be anything more than a quite mild flu virus for us. So far the cases here have been mild with people being fine within 2-3 days.