my sister

I'm 3 months pregnant, and my sister is engaged. she's been going to random dress shops for the past few weeks with my mom just getting an idea of what she wants, but today she "said yes" to a dress. I wasn't there, I wasn't even invited to be there. I've been completely left out of the entire process. to top it off, they were planning on getting all of us together next weekend to HELP her find the dress. I've never been so upset & felt so left out before in my life. i dont know if this is hormones, or if I'm just so tired of her wedding being more important than my feelings. if I'm going to be left out of her wedding I want it to be my choice, not her leaving me out. I don't want to be made to feel like shit because she can't think about anyone but herself. and if you're just going to be a bitch instead of trying to see my point of view, don't comment :) I have EVERY right to be upset and I'm completely justified in this.