Symptoms?

I'm kind of freaking out. I'm 7 weeks pregnant with my first child. I found out a week ago that I was pregnant, and everyday since then, I've had cramps, and not really any other symptoms. But yesterday, I only cramped maybe twice, and today, no cramping, and still no other pregnancy symptoms. My first ultrasound is in 2 weeks. I'm worried that I may miscarry. Is this normal to experience pregnancy symptoms, and then none at all? I've had no bleeding or spoting.