lim,
i went to korea when i was 28-29 weeks. I went with Asiana. I called their office, they say they dont have a guideline as to how many weeks u can or cannot travel with them. They asked me to get a gynae letter ready. The airport staff only asked me for the letter before i departed but never ask me for it again on my trip back.
Flights to korea r normally nite flights and they last 6 hrs. can be quite tiring if u do not get a seat whereby u can lie down completely. If u r 33 weeks, tendency to get swollen legs. If possible, I still dont suggest u go.
brenda,
week 12 and 14 should be ok if your pregnancy has no complications.