pregnant and scared

I am going to be 20 on Tuesday and I just found out yesterday I was pregnant. if my dad and my step mom find out they r going to kick me out. I know I need to see a doctor but I am under my stepmoms insurance and I don't want it to show up in the paperwork y I was at the doctor. I even paid for the pregnancy test myself at planned parenthood because I didn't want to havey parents find out. what do I do?