Trying to be calm

My first ultrasound is today.
The few symptoms I've had I could blame on progesterone.
I'm so nervous that the doctor is going to say sorry, there is no baby there.
Luckily Rob is probably going to be able to be there with me.  I didn't think he would be able to be there, but I am glad that he probably will.  If the ultrasound goes bad, I don't want to have to tell him later, and if it goes good I don't want to tell him that I heard the heartbeat if he doesn't get to.