Starting out in Chiang Mia Thailand Nov 2009, we never imaged traveling while pregnant. Here we are 6 months and 2 weeks along in our pregnancy in May 2010 still in Thailand.
Traveling while pregnant isn't easy and has a tendency of leaving a preggers woman drained. It is however, stress free, and involves eating much more fruit. Also, in much of the world people constantly rub your belly and tell you the gender and send you off with well wishes.... sweet.
I am the first to admit dangers; such as rabies, Hep, Dengue fever, Malaria, the extreme heat, no cross walks, and a host of bacterias and viruses that thrive in these conditions. If precautions are taken then there is far less to fear. Some examples are to wear bug spray, stay out of Malaria/Dengue areas (as much as possible), treat cuts and wounds with great care, do not wash wound until healed in tap water while in Asia, eat at reputable places, take a long time to cross the street, and sleep in an air conditioned rooms.
That's my 2 cents for now.