I'm 21 years old and I'm currently 11 weeks pregnant (will be 22 when the baby comes...)
I've been with my fiance for 4 years, we live with my mother and brother and we all get along really well.
In spite of this, my mum has always said things like "If you were to fall pregnant I would kick you out of home, you'd be out of here and on the street, I'd disown you..." and horrible things like that so when I found out that I was pregnant (despite how happy I was) I was absolutey petrified of telling my mum.
Turns out my mum and I were the only ones at home when I first discovered that I was pregnant and I was so shocked and excited that I didnt even think- I just went straight to her and blurted it out.
Admittedly, her inital reaction was pretty negative. She started freaking out and saying things like "how could you do this to me? My life is ruined...." and turned it all on to herself! I ended up yelling at her and telling her to grow up and stop being so selfish. She still spent the next few days sulking over it, but just a week later she was over the moon! She wants to come along to all my doctors appointments, she even starts crying when we're walking around the shopping centres looking at baby clothes cos she's so excited!!!
I realise that my situation is very different to yours, but I'm sure your parents will come around eventually and that they will support you through this.
Hope it all works out...
Katie, VIC, Aaliyah Kaylee born 28/11/06 & Mikayla