Mother Inflicting Hate & Stress!

It seems that ever since I became about 23w my mother has been inflicting a crazy amount of Hate, Negativity and Stress towards me. I'm so confused! I thought mother's are supposed to be happy for their daughters once they become pregnant. Not having BiPolar freak outs, shoulder checking them while passing by and yelling at them and then trying to blame "menopause"...(she's 50!) an Unlike my older sister (whom just popped out her 3rd kid / 3rd babydaddy) I'm having my 1st child @ 22 by my Husband whom I've been with for almost 3yrs! I've successfully graduated from college and have a 36k/Yr Job secured. Yet instead of praise I recieve constant criticism and hate! I can't take it anymore! I'm already stressed at the fact that my husband won't be able to come back from over seas for the birth of our son but all of this negativity and hate I'm having focused on me has me feeling like I may end up on the next episode of Snapped!
​What's worse is she has her church friends and other's thinking she is a complete saint and that because I'm pregnant I'm being "bitchy" and "testing her".  We can't even have a convo about the weather w/o her wanting to argue and scream til she's right!
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 I'm seriously considering telling her I don't want her present when I'm in labor/delivery and even after. I'm about to be 37w and all of her yelling and verbal/physical abuse is just to much for me!