Congrats Diva on the property purchase and Uber on the scan. Sorry if I've forgotten anyone.
Kiki I just did a long hall flight and my consultant prescribed baby aspirin-- you can't get it without a prescription when pregnant but your DH can buy it easily enough for you. It works a a blood thinner to reduce the risk of DVT. He also told me to drink loads and to get up and walk around for 15 minutes every couple of hours. I have work colleagues that have done long haul flights that pregnant for business so I'm sure in fine in general.
If you are going to the US, get travel insurance with medical coverage and make sure it covers pregnancy. After 28 weeks, most standard policies won't so if you go later than you are currently expecting you'll need a special policy.
Lastly, if you are worried about Zika check what types of mosquitoes are native to the area you are travelling to. I'm from Miami (heart of the outbreak) but everyone knew it would happen as the Zika mosquito (Aedes Aedini) is native to Florida. That is the only type of mosquito currently known to transmit the disease but its not just in Florida, it is elsewhere in the US.
Spain has had lots of people travelling back from South America return with Zika (as you'd expect) but as they don't have the right mosquito, its not been transmitted from those people to others unlike in Florida.
Good luck! Despite being from the US, I've never been to Texas but I know some of the cities there and scenery are meant to be great.