A big Congrats! Thats great news! Its a great feeling when you get past that 12 week stage!
Babies and WDW are made for each other! We took my son when he was 8 months and even though he was (is!) a "challenging" child, he loved it and I found it easy to manage. The facilities are excellent, both on the planes and at the parks.
I hope the rest of your pregnancy goes well, and baby already has lots of DIS cyber Aunties and Uncles ready to help with any concerns you might have!!
Allie
xxx