Telling my mum I'm pregnant

So today I've been signed off work again due to my bad morning sickness.
I am meant to be meeting my mum tonight after work for a drink.
Since I'm not at work and don't want to hide things from her anymore I have come to the conclusion that I need to tell her I'm pregnant. Me and my partner wanted to wait until our 12 week scan but he thinks now is a good time to tell parents since I'm struggling with morning sickness and need some help and support. I'm 19 years young living with my partner and in a happy stable relationship. I'm so scared to tell my parents because I don't want them to react badly.
Can someone please give me some advice on how to tell my mum?😓😓😓😓
I've just recently spoken to my dad on the phone and told him. Thankfully he was so supportive. (I'm a daddies girl so I was dreading telling him) just mum left to tell!🙏🏼