Feeling nervous at 12 weeks

Jamie • Gave birth to an angel 20/4/15 10:12am. 💕missing chloe💕Just waiting to feel whole again.
This entire 12 weeks I've felt kind of weird. During our first scan yesterday the baby didn't move much and the scan technician said it was just sleeping but it made me feel so nervous like something might be wrong. I can't help but feel like I might be the one of the small percentage that has a baby with something different and perhaps 'wrong' with it. I tried to feel excited during the scan but I'm just so nervous, I was really close to crying. Has anyone else had this kinds of feelings? Is it normal?