Am I wrong?

I’m currently living with my mom and I’m 11 weeks pregnant. Twice this week I’ve had to unclog my 15 year old brothers shit out of the toilet and I’ve had enough. I told him to clean it and he said no, he’s not doing it. His room is disgusting too as well as my 17 year old sisters. My mom got mad at me for bringing it up because I’m in HER house so I should clean up anything dirty I see including a clogged toilet. WTF?! I also pay rent, buy all my own food, and clean up any mess I make. Am I in the wrong? I’m so pissed. She’s always treated me like shit but this is really the icing on the cake. She also lets her dog poop and pee everywhere without cleaning it up so the whole house reeks. If I bring it up she tells me I should potty train him if it bothers me so much. I’m miserable and have nowhere else to go so it’s not like I can do much. I’m just so upset I wish I could disappear 😭😭😭 I have no family support whatsoever and my mom is crazy. She even still threatens to hit me as an adult after already being physically abusive when I was a child/teen. I’m so lost and the pregnancy hormones aren’t helping me feel any better 😭

Update:

I have been looking for a different place, unfortunately I’m single with horrible credit and don’t have more than $600 a month to spend on rent which pays for nothing where I live. I moved out at 17 and destroyed my credit trying to be independent which is why I pretty much have to live with my mom now. If I had the means I would be out now. ):