I hope this is not your first or only trip to the World. If so, and if it is at all possible, I'd reschedule it to a time when you can really enjoy it. Just remember to give yourself a
minimum (more depending on how your idividual situation) of six weeks post delivery to recover. You will also need to discuss taking your baby out of the house on a trip like Disney World with the peditrician. I took my son for the first time when he was 9 months old. That was a great age. You may not want to or be able to wait that long. People take younger babies than that. Again, all of that is up tp you, your OB/GYN, the baby's ped, and your work schedule.
If you do go while pregnant, you can have a great time without feeling like you've missed out on too much. There is no better place to be than the World when those food cravings hit. :slurp: There are also lots of places to shop for your little one (even if you do not know the gender). There are more things you can do than not. I went at six months. Here was my list of avoids with an explanation. My OB/GYN was a World frequenter so he knew what to advise me against.
MK Rides
1. Space - the seat design, the bumps, sharp curves at those speeds
2. Big Thunder - seat design, bumps
3. Splash - surprisingly not the drop but the seat design coupled with the drop
4. Stitch - restraint on seats
Epcot
1. Test Track - speed, sharp breaking, etc...
2. Mission Space - the Gs and seat design
MGM
1. Tower - the drops
2. Aerosmith - lots and lots of reasons
AK
1. Everest - lots and lots of reasons
2. Safari - it was very bumpy (I had issues in the beginning with internal bleeding - they cleared up early in the first 12 weeks, but I didn't want to take the chance)
3. Dinosaur - it's rough
Morning sickness is actually an indicator of a healthy pregnancy. It has nothing to do with what your limitations are. Just think of it this way. For the most part, you can ride things while you are pregnant that you would ride with a baby.