How do I tell my mom?

Brittany
I'm sitting here thinking of how to tell my mom I'm pregnant. But for some reason I'm too nervous to tell her IDK why. I wanna tell her by showing her the ultrasound of the baby but that's on the 23d this month and it's seems far away to me. My fiance want me to just tell her and my best friend wants me to tell her. And idk how to.