Pregnancy announcements

A little back story..
I'm 21 years old have a gorgeous 5 year old daughter, have been with my current partner for almost 2 years. I'm currently about to begin court proceedings for custody of my daughter.
But recently I have found out my partner and I are surprisingly 6 weeks pregnant. It was quite a shock as we always practiced safe sex. But we are busting with excitement nonetheless. My partners first child and my second. We are so excited. We have told our closest friends, who were all also happy for us. Now comes the time of tackling telling my parents. I know how they will react. Will be in a lot of shock and my mum will make no secret of her disapproval. I think I'm looking for ideas which I could tell my mum, and when I should tell her? I am dreading telling her even thou it doesn't change my feelings at all!
And I'm also after some unique ways of announcing to Facebook friends?
Thank you in advance !