Discrimination in work with Pregnancy

[Anonymous <squeekicookie@aol.com>]

I am having a problem.  I am pregnant and ever since I told 
my employeer that I was, she has written me up, given me a 
bad report, treated me unfair, upped my hours after my 
doctor had given me a letter to change my hours in my
schedule(not to cut down the amount, just change how many in
a day or a break in between the days), and has verbally made
me feel like I am not worth being there even though I am 
still high up in the department that I am in, I am praised 
by other employee for helping them, and in charge when the
superviser is not there.  If I am such a bad employee, why
is it that I am still in charge of people, and given 
reponseabilities that I had when I wasn't.  Its not like 
someone else couldn't do the job, but apparently I am the 
best choice in the matter.  They also keep asking me weither or not I really feel up to being there anymore.  I 
enjoy my job and I want to work through my pregnacy as long
as I can.  I want to know what I can do to stop the 
descrimination that I am experianceing and to stop it 
from happening to anyone else who comes in to the same 
situations that I have experienced.  I am 7 months and I 
want something done before it is too late. Thank you