Troupial (Icterus icterus) female starts to incubate

I don't know exact when the female starts to incubate her eggs, but I began to notice on last Sunday 06/19/2011.  I have no idea how many eggs in the nest and whether the eggs will hatch or not, but this is a huge step toward my goal of breeding Venezuela Troupial sp.  According to all the information i can gather from internet, books, etc.. Female troupial will incubate her eggs for about 15-16 days, and fledge in 22-23 days.