Emilio,
I wish I had seen this thread earlier, as I was going to tell you that I have hatched plenty of eggs that started out with just a trace of veins. Typically, if the egg is not yellow colored (like Tosha mentioned), but has a few veins, you will be able to watch the veins multiply and grow over the next couple weeks.
Congratulations on the egg doing well from you, and I hope you hatch something special from that egg.