Pregnancy and masks

How do you deal with wearing a mask for 8 hours at work while barely being able to breathe normally being 30+ weeks pregnant?

I am going to be returning to work, and my boss is requiring staff to wear masks.

Masks and anything confining my breathing space already makes me claustrophobic, and now added shortness of breath in this humid weather while 30+ weekz pregnant has my anxiety through the roof.

We srent using those blue Masks, he has heavier thicker masks for us to wear. I used one to clean once and couldn't do it.

I honestly want to cry.

Edit to add: im in manitoba Canada and we have a VERY VERY low case count. I live 2 hours away from where any of the cases have been in MB. I'm not concerned about catching the virus, im from a very secluded area and there hasn't been any cases spread this far. So we aren't high risk, and we don't work with the public (day program for adults with disabilities) they have been home since March and my work is now allowing them to come back slowly.