Issues at work!

Has anyone ever had to deal with rude nasty women while pregnant? I am 29 weeks and work in a preschool, all women. It started off with one girl not wanting to give me bathroom breaks because I am pregnant and that isnt her fault. We can't just leave the room. Now it is I don't do anything and my co teacher in my room says she is burnt out because she is having to do everything which isn't the case. One tecaher complains that it isnt fair that the teacher across the hall gets pumping and nursing breaks....have never seen or experienced such negativity before.