Worried!

I am in no pain,and have missed my period and have had three positive tests (one from a urgent care)so I know I’m pregnant.i don’t have my first ultrasound until tomorrow and I am so scared something will be wrong with my baby or that they won’t find a heart beat because I’ve been wanting this for so long and it just seems way to good to be true!i am so nervous!is this normal!im terrified I won’t make it past 9 weeks this is my first time being pregnant