23w3d :)

I got some great news from my 17 year old sister last night and that was that she's pregnant, I don't feel jealous but I'm pissed off is this normal? All my family have said she's done this because I was getting attention and pressies (for baby) and I think that to but now my mum has cut me off from the family because I simply said I was a bit angry :/ don't know what to do.