A friend of mine flew from Australia to Los Angeles and home again (obviously) while 7 months pregnant. Doctor told her to stay extra hydrated, get up and walk, use the compression stockings. He also said to make sure she had at least 7 days on the ground before getting back on the plane to go home again.
The flight was just fine coming and going.........her problem was once she got on the ground in LA. Some people just get a "travel belly" and get diarrhea no matter what they do. Well she did and she had to drink things to rehydrate (obviously) but with electrolytes to help replace what she lost. She was just fine, but just so you know just in case you have any tummy issues once you get to your destination.