I went to Korea when I was around 7 months. Doctor said it's good for me to go out for a short trip.
In case you were very stable in the past and nothing special, guess you can go as well. For my case, I can run and jump all the time even I had a very very big belly that time!
Of course, better check with doctor first, he needs to give you a certificate/prove anyway.
其實doc said ok usually that'll be ok, the most important thing is that you r feeling ok. if u r type of the travelling person, that should be fine for you. just to drink more fluid, water juice whatever, u 'll be dehydrated otherwise.
if exceed 30w, u'd better check with ur doc. but most airline won't allow you to fly on 35-38w. (too risky)