Telling the parents.. Is not fun :(

So I am going to be telling the parents soon.. I am going to be a single mum. I'm nearly 4 weeks along with my pregnancy
I'm 24 year of age, I have my own business of 8 years! I am a dog groomer :) I love my job, I am mobile, so I drive to people's houses and do it there.
My mother and me never got along ( I am a daddy's girl ) my mum is old fashioned in a sense of get married then have kids .. But my dad is the cool guy, and thinks he's funny :P 
How can I say it ? Or break it to them!? Any ideas? I'm the kind of girl that hates her mother being disappointed in her.. I always want approval from her.. Someone help me out ? 
I live out of home at my cousins house.. My parents are actually buying me an established house to live in - as I'm sick of jumping house to house.. So I will give them like 150 or so a week .. 
Thank you ladies :)