Need advice from other pregnant teachers!!

How do you keep yourself healthy during pregnancy working in a school? I taught for prek for my first year last year and I remained relatively healthy only needing a sick day a couple times. However now that I’m pregnant I’m scared I’m gonna catch everything that walks through the door. I don’t do anything without washing my hands already and I use hand sanitizer religiously but is there more I can do?? I really do not like getting sick and especially want to stay away from any stomach bugs and the flu please help I also have a 3 year old who goes to preschool which doesn’t help she was sick a good bit last year but I managed to not get most of what she had because I have a pretty good immune system.