Traveling during 1st trimester!

Hello! A few questions for experienced mommys. Or anyone who has help in the topic :) My husband and I are super excited we are pregnant. We just found out with a home test after missing my period so I'm guessing I'm about 5 weeks along. I already called my obgyn to make an appointment BUT earliest I could get in is right after we get back from our planned trip overseas to Europe which is in a week. What should I watch out for or be careful with while traveling at such an early pregnancy stage?! Thanks!!