Ttc but work at taxidermy

GG

We are TTC but I currently work in a taxidermy shop and I’m around harmful chemicals everyday. I’ve already discussed with my husband that as soon as I find out I’m pregnant I don’t want to work here anymore. It’s going to be harmful for me and the baby. Do I need to leave now and give my two weeks notice or do I tell my boss when I find out I’m pregnant?? Boss knows we want to start a family soon.