I need some advice about my dads girlfriend?..?( kinda long)?

first of all it is your house your rules they can't respect that then it's time for them to move out. also you are pregnant you do not need that stress. i would sit down with your father and have a nice talk and tell him that you are pregnant and can't do it any more that they have to find a place of there own and give them a time limit. also i would bring up his girlfriend nicely that she is disrespectful to you and you do not appreciate it. i say be open and your father is a big boy and needs to move on before you and your fathers relationship gets worse or even it can interfere with your marriage. there adults they need to act like one