First scan on Friday and I'm so scared ...

Emma • First baby due 15th Feb 17 Baby BOY 💙
So I'm 12 pregnant on Wednesday and my first scan on Friday 
I feel like I've waited a life time for the day to come 
However I'm mortified incase they say 
"Sorry no baby"
I've taken so many pregnancy test and had blood test from the doctors and feel every single pregnancy sympton 
So really don't know why I'm feeling so stressed about it like someone's going to tell me it's all been a dream.
I know on here people tell us their sad stories about the baby stopping growing or a mc  etc etc which I understand they say it on here to get reassurance and comfort from other people going through the same thing .
But it's making me soooo scared