Do I have the right to be upset?

Hi, I am 27 years old and 35 weeks pregnant. I have a serious issue. Please do not post pathetic answers that will not help. This is my problem. I left my house when I was 18 years old. I lived on my own till I was 21 years old when I met a man and moved in with him. For five years I took his crap, from him being drunk all the time, to fist fights, to almost fighting his brother, even his mother lying and saying that I was cheating on him. Eventually I got tired of the life that I was living. "Tom" ended up telling me that he wished I would cheat on him that way he would have a reason to leave me.. Well, I did. And I did with a a man 14 years older than me, who treated me with respect. This man had a vasectomy and to my luck throughout this time I got pregnant from "Tom" my then husband. When he found out that I cheated he beat me and at this time I did not know I was pregnant already. So what I did is left him even though he did not know the specifics about my cheating. Now I am back with living with my parents after 9 years. Here is my question. My sisters have grown and they are being raised very differently from how I was raised , although we have the same parents. I was raised with a home responsibility. Cleaning, cooking, being a homewife. They were not, so everything is always dirty and they expect me to clean since I am here all day. I dont mind it but when you are 35 weeks pregnant and live in a two story, 7 bedroom house its kinda hard not to be pissed if they cannot even clean a restroom. Besides all this, a sister that got married less than a year ago is back after leaving her husband and she wants to come back to talk smack about how I am. She is 25 years old and although she has lived with 3 different men. no more than 6 months at a time, she wants to come and demand for it all to be about her. Am I wrong to be pissed and want to leave this house even though my dad is super excited becasue this will be his first grandchild? He has treated me so well, here but I cant take my sisters ways. What do I do?