Working while pregnant

Who can give me advice am currently pregnant I took a note to my boss stating that I have a weight limit of 20 lbs and no lifting my patients so she later calls me, and asks me how am I still able to do my job I then tell her I am still able I just won't be able to lift anyone she then says it's only so much we can do till it becomes a burden I go to work and I do my job unlike other people I was mad but going to have a meeting today on how they can help me but she sounds like they are not willing to work with me I just hope I don't get fired I love my job. Please someone give me some advice.