Needed some advise.... abuse

I’m not sure if this is the right group but I do want some advice. Basically when I was a kid my sister use to hit me whenever she looked after me and as I got older her aggression because worse she hit my mum and get arrest for it and just got bail, she also tried smashing my face against a wall. On Saturday she kept having a go at my little brother and hitting him and I told him she wasn’t worth it and she came up and punched me in the face and if it wasn’t for my boyfriend and I really don’t know so I did call the police and also told them she was a drug dealer (which is true) was I in the right? I know she’s family but she is a danger and I should mention I am also pregnant