First, congratulations on your pregnancy! Hope it is smooth sailing and uneventful delivery!
Second, the questions you ask are probably best answered by 1) your PMD (or OB/Gyn), and 2) your place of work.
The facility should have a plan in place to protect pregnant employees from potential on-the-job hazards.
For example, if you worked in a Radiology Department and became pregnant, there should be a minimum education plan, and then a staffing plan to protect you and your baby from exposure to radiation.
In the same way, a plan should be in place for 1) education and 2) implementation of safeguards for any occupational hazards, to protect you and your baby.
As the Terms of Service prohibit any dispensing of medical advice, please rely on the above two sources for your information on this subject.
Thank you (and again: congratulations!)