Do you ever fear Miscarriage?

I'm 22 weeks today and it's just now hit me, I'm pregnant!! I'm loving every min of it. I just want my baby boy to be a one healthy baby. So far everything good as far as heart beat and at the ultrasound. Doctor didn't see or find anything wrong. But what are the chances of having a miscarriage when you are this far along? My last pregnancy was okay until I was around 30 weeks with my daughter, they noticed I was measuring small because I had low amniotic fluid. And was induced at 37 weeks she weighed only 4lbs 14oz. This time around I'm trying to be more careful and be stress free and hoping my boy would be a little bigger and healthy that's all I want..but I'm just afraid of anything bad happening..?