Working

What are thoughts on working threw out pregnacy. I'm a personal care assistant I do a lot of lifting bending stuff like that. I'm physically drained and in so much pain. My sciatic nerve acts up and makes me fall to where I have to catch myself and also goes numb while walking.  My doctor told me today that my baby girl  isn't gros my like she should An I shouldn't be lifting. I'm scared of telling my work due to losing it. My doctor didn't give me a note but she said listen to my body since this is my second pregnancy and all my muscles are stretched out and loose and I'm