My question involves emancipation laws for the State of:Oklahoma

im 17 years old and im currently not enrolled in high school i live with my mother my grandmother and my seven year old brother. my grandfather died december third and ever since this has happened my mother and grandmother have treated me like i am nothing. I get called a bitch and told im hard to even look at all the time my mother tells me to get out and go to my fiances but then turns and says to go to my fathers and thats where i will go. my fiance has an apartment and a steady job at Sitel. my father when i was young did drugs and beat me i do not want to go back to him. when i get to my fiances i was going to enroll in votech and get my GED. with all this do you think a judge would grant me emancipation. they treat my brother like a little prince. when it comes to me i get treated like im nothing. when i come home i fall into deep states of depression. i dont want to be in this enviroment anymore. could you also tell me how much you think it would cost to get emancipated? and if im pregnant by law do i have to wait untill the baby is born or can i leave as soon as i know?