We went when my dw was 6mo pregnant. The major difference for us was that it was December. HONESTLY OUR BEST DISNEY TRIP EVER!!!!!
This was prior us purchasing
dvc, but it really help solidify our decision to eventually buy. We took the trip at much slower rate than our previous trips. We always knew that we wanted dvc, but that was because we knew that we save $$ in the long run. But we found the Magic in the little things..
1. Purchased that picture at each park that take when you walk in. We made a frame with all four parks. We call it, "Four Parks, One Baby!" Our now 21mo loves to go up to the custom framing that we had done and points to mommy's belly and says, "baby".
2. Water Breaks. Now, we been to wdw in May, so we know water is important, but it was so nice to slow down, sit down, and relax by people watching. A good learning experience for expectant parents.
3. PARADES!!!!!!!!!!!!!!!!!!! My ds would "dance" in my dw during the parades. This made mommy feel so special to share her parade music experience with her unborn son.
4. Attractions: My ds absolutely loved Pirates and Small World. The music was too much for him. This past trip in May, was the first that that experienced Small World from the outside, and while he stood between us and danced, my dw began to cry thinking back to our December '01 trip. She did ride the Safari at AK, there is a seat, towards the front that has "less bumps". If you decide to go, just avoid the mountains.
In summary, if you can handle the heat, I say go.. It just might make your wdw vacation even more magical.
Edward