How do I get over my fear, is this normal for FTM?

I seen my baby yesterday for the anatomy scan and the baby is perfectly healthy ultrasound tech said that he was the most active baby she's seen in awhile and that it's a good thing. For some reason I cannot shake the fear of stillbirth, is this normal for FTM to worry about this? I've had a miscarriage with my first pregnacy and feel like my fear is driven from that. Please no negative comments..