Advice!

Okay so I'm 34 weeks pregnant. In a few days the place I work (small local restaurant) is having a spring cleaning day. Using lots of chemicals and all that stuff. They want me to come help. Last year I almost went to the hospital because all of the fumes caused me to have asthma attacks ...so should I tough it out and help out orrrrr say no I can't breathe in that amount of chemicals especially being pregnant