ultrasound advice?

So I'm 5 weeks 1 day and I get my first ultrasound tomorrow.  I should be super excited, but I'm really nervous!!!  I've had 2 miscarriages and I've never actually had a happy ultrasound.  The most recent one was when I had a missed miscarriage so we thought everything was fine when we went in.  Any words of advice to help ease my mind between now and tomorrow morning?  I feel like I'm going crazy!