Well done Fluffy 
I'm so pleased to see your updates today.
I hope you are starting to realise that the midwives will really help you through this.
I'm also pleased that you are going to speak to your friends mother.
If she's as nice as you say I'm sure she will help you speak to your mum.
I know that I would help in her situation.
Remember what a lot of people have said about your mum.
It will be a huge shock and she will need a little time to process it. This is why it might be better for your friends mum to speak to her first.
She will have questions. It's inevitable.
Most likely about why you didn't tell her and who the father is. She might ask why you didn't use contraception.
My advise is to be honest. Tell her what you've posted here.
Finally, don't worry about asking "stupid" questions on here. There's no such thing.
Unfortunately on here we sometimes get people lying about their circumstances and as a result some posters are very wary of that and find it hard to believe people who need support.
For my own part I'll be honest, I'd much rather respond and help using a small amount of my time rather than risk someone in genuine need not getting the support they require.
Good luck tonight.