How do I tell my parents?

Rebecca • First time single mum to my Penelope Ailsa 💜
So I'm 6 weeks, and I live with my s/o. My relationship with my family has been rocky ever since I was 12, and I was kicked out at 18. I'm now 20, and they hate my boyfriend and the fact Ilive with him and his family. 
Now that I'm pregnant, I'm so worried about them completely rejecting me and the baby, especially as recently we were starting to get back to being happy. I just know that a "baby bombshell" will send us back to the start. 
How do I tell them?