Get some sleep while you can. Probably not tonight tho. You'll be up 1/2 dozen times making sure they're breathing, eating, not too cold, not too hot. Trust me, you will!! It's a blessing when mommie dog has the kids, but now is the time you just get started!! Wait for about 3 weeks and you'll see what I mean.
But it's all good. Don't ever let anyone tell you it isn't!!
Suz