If you are pregnant you should seek guidance from your doctor/midwife. If they give you permission to fly, then contact the airline for their rules on carrying pregnant passengers. Most airlines will not carry you when you are at the end of your second trimester, i.e. over 28 weeks into your pregnancy. Remember to work out how many weeks you'll be by the time you fly home - it would be terrible to be somewhere and be unable to get back because of airline restrictions. Most airlines will ask that you provide a medical certificate if you will be more than 28 weeks into your pregnancy on your return flight. You can obtain this certificate from your GP or Midwife, without one airlines are very likely to refuse to carry you.