JG2 - Sending you love and hugs.
While I know it doesn't provide you with any real comfort, I have known many other women in this situation who, with proper monitoring, have sailed through this with no trouble. (My sister included, with her first pregnancy!)
Try to rest. Find ways to calm your worries through meditation, prayer, or whatever you find strength in. And just keep asking questions of your medical professionals!
*HUGS*
"Two drifters off to see the world. There's such a lot of world to see. . ."