Don't know what to do?

So I'm about 5 weeks pregnant and I work In a very hazzardest place, Home Depot. I pick up heavy items and handle paint and stains which has a great amount of chemicals. When I pick up 5 halls of paint I feel a sharp pain in my lower abdomin. I told my supervisors and they said, "Sorry, but we've seen other women do it, and so can you."