8 weeks today - symptoms

I'm 8 weeks today and my first ultrasound is scheduled for Monday the 21st. I'm so nervous because I have no symptoms at all.  No MS, no tender/sore breasts. A little tired but not overly. Besides the positive test and no period, I would never know I was pregnant. I know many people who would say "oh you're just lucky" but my nerves are kicking, especially being my first pregnancy. I'm so nervous they won't find a heart beat or say the baby stopped growing.  Anyone else experiencing this?