The safety issues have already been covered amply here, so I'll just chime in with some advice for morning sickness. You might consider carrying sour candy and/or ginger candy with you. I found both really helpful in averting milder morning sickness.
Congrats, and have a great trip! (FWIW, I went to WDW when I was 18 weeks with my second child, and will be 25 weeks with my third when we go next week).
Congrats, and have a great trip! (FWIW, I went to WDW when I was 18 weeks with my second child, and will be 25 weeks with my third when we go next week).