I want to see my family instead of staying with my unplanned pregnant girlfriend
Do you always spend a lot of time with her?
I am always with my girlfriend or vice versa
It's okay to want to spend time with your family over a girlfriend. Just be honest with your girlfriend and make sure she has a place to stay. If she's reasonable then she shouldn't get upset at this request.
She's not reasonable and she freaks out.
Well you also need to take time and live your life. If you are together so much it could get overwhelming and you might break up.