My first trip to WDW I was 3 1/2 mo along w/ #3 ( who will be having bday #11 in 2 weeks), all I can really remember is getting dehydrated very easily, it was the end of may and very warm and humid!
I was sick only once and that was all my own fault: I was so thirsty that when we finally sat down to dinner I was drinking the soda and water as fast as the server could get to it. I drank so much so fast the nasuea hit me fast and hard. Also there are a few pics of me that my darling hubby felt he had to capture showing how incredibly tired I was
So advice:
keep yourself hydrated at all costs (extra bathroom breaks!)
take it easy and avoid really long days, you need to get enough rest!
Eat right, junk food can be awfully tempting, but remember you need good nutrition to keep healthy.
Use common sense when it comes to rides, they'll be there next time.
don't let hubby have the camera later in the day when you're looking exhausted (and probably feeling it too!)
Congratulations! I'm sure you'll have a wonderful time
