Zuen,
Like what many moms have said, survival rate is high, so do keep your spirits up. Have the gynae ask you to do fetal counting? Good to do and see her once you dun have more than 10 movements in a day.
Cactus,
Actually not advisable to travel in 3rd trimester. I think immigration will also check tighter when they see that you are heavily pregnant. I went San Fransico with my gal in January to look for my hubby, got ask to go to the investigation room. Imagine, after a day's flight still have to go to a room to answer questions as to your itnerary, who are you looking for, etc etc. But if you have to go, do check with the airline, I think they have certain limitations.