You are lucky! I would go for it!
It's funny because my grandparents housekeeper got pregnant and I was like...well, is there any way to see if you she's going to give it up for adoption?
I just kept wishing something like this would happen to me! I have heard other stories like this.
It sounds wonderful. Of course, Dylan is an amazing kid and that would be very tempting to pursue also.
But this is a pretty fabulous dilemma. I would adopt the child that is coming into the world soon. That is like a gift from heaven. I would never be able to let that go. (That's probably why infertility drives me so nuts...I imagine being mom to all these imaginary kids--but the same thing would happen with a potential adoptee!)