Chicken pox in my son daycare class

Ka

I’m currently 21 weeks pregnant and 5 kids in my 1 year olds class and I herd it’s bad for pregnant women? I have never had chicken pox before or been vaccinated for it since probably primary school. What should I do if my son starts to show symptoms as he lives with me so I can’t avoid them? The question is more what do I do about me being pregnant not about him if that makes sense