I need to vent I'm sorry..

it started back in April when I told my work that I was pregnant at first everything was ok then I kept getting harassed about leaving alot to get water or going pee after a month or two I had to get a doctor's note just for me to have my water and pee breaks then things got a little better..but then on the note the doctor said no lifting more then 20 lbs because of my back I was working as the assistant manager of the deli department/ normal worker they stopped me having to do with anything assistant manager like around 3 months of my pregnancy and cut my hours to 30 instead of 40 hours a weeks but I was extremely tired in my first trimester and didn't mind things started to get better then all of a sudden I was told yeah you will be working 4 hours for three days a week I can still do my job I can do 30 hours I only have three weeks till my maternity leave and I was told oh you leave the department to much to pee and take breaks I don't understand why now I need the money its why I'm working so hard can anyone give me any advise....