Going back to work during Covid

I’m am entering my 2nd trimester next week and I was asked to come back to work but I am

Extremely afraid and I work in childcare and the center is not the cleanest, children are always sick and I have a high risk pregnancy already. I have difficulty breathing in general so wearing a mask for a period of time can be hard on me. But bills must be paid and unemployment runs out. Anyone having a hard time with going back to work? Do I need approval from OB to go back to work?