I agree that the shapes Dany saw in the tent were representations of R'hllor and the Great Other.  I believe that Rhaego (the blood of a king) was the sacrifice required to hatch Dany's dragons. One interesting thing I noticed from my re-read was something that occurred when Ser Jorah was yelling for the birthing women to help Dany, and was told that they had all gone.   "The maegi." someone else said. Was that Aggo? "Take her to the maegi."   The voice was never identified, but it was clea