1) Check with the airlines or the ship company you’ll be boarding regarding their rules on pregnant passengers. Different airlines have different rules, so when I checked with the airline I boarded a few years back, they only allow pregnant passengers who are not more than 8 months pregnant to board their aircraft.
2) Check with your Doctor if you’re advised to travel with your condition. Your pregancy must be normal and without complication to get the Doctor’s approval to travel. If your Doctor finds you fit to travel at 7 months or 8 months, then ask him or her to give you a letter of certification.
3) Wear comfortable light clothing and comfortable maternity wear. You’ll be traveling for quite long time, so make sure you’re very comfortable. I’ve found some nice and fashionable maternity wear that’s made from Italy. You can check out their site too.
4) Bring along some light snacks and water. You’ll never know , you might get hungry at the middle of the trip and there might not be any shops around.
5) When boarding the plane, make sure to sit on the aisle seat. When in the ship or train, make sure your bunk is near the toilet. You’ll surely be going to the bathroom more often during the 3rd trimester.