Pregnancy after miscarriage

How do you ladies handle the anxiety that comes with being pregnant when you've had a miscarriage? I'm 6 weeks now, after a miscarriage at 11 weeks in October, and I can't let myself feel any happiness or joy because I know something terrible could happen. I had am early ultrasound where they saw the gestational sac and yolk but no fetus - which I know isn't abnormal for this early on, but I'm convinced it means I'm going to miscarry again.