Work during pregnancy

Amanda • Momma to two boys, expecting a baby girl! 💕
I am 31 weeks and still working 5 days a week as a caregiver for elderly. I do quite a bit of physical work like helping people get up in the mornings, lifting in and out of chairs, cleaning, laundry, meals, etc. I'm starting to have quite a bit of painful cramping while I'm working. I have an appointment tomorrow and plan on telling my OB about this but I'm terrified she will tell me I should stop working. I want to work as long as possible to save more money. Has anyone been told to stop working early for any reason? If so what was going on?