More Ultrasound Nerves...

Tomorrow is my ultrasound, and I am a nervous wreck. I am so excited, but there is a part of me that is worried that I won't hear that heartbeat. Even though I tell myself that I am sure everything is just fine, I feel so good, no morning sickness, no real complaints at all, I still keep worrying that something might be wrong. I am just thankful that my mommy can come with me and keep me sane. Am I being a nutcase, or is this normal???