I know how you feel. I was so anxious waiting for Finn's litter to be born. The due date came and I was checking the website every 5 minutes for updates. She ended up delivering 2 days late and was in labor for over 24 hours. The anticipation was awful. One pup would arrive then 4 or 5 hours later another would come then there was a very long break before the last two were born. Waiting for a blue makes it even worse since they are harder to come by and then when you narrow it by gender it gets worse yet. My breeder said I must have wished the litter into being because it ended up being 4 blue males, a blue female and a tri male. :)
Here's hoping for a predominantly blue litter for ya! :)
Finnigan's Dad is blue and his Mom is black and white. I don't know that it makes a difference which parent is the merle, though I have noticed that most use a blue merle male to breed.