TTC with travel plans

My boyfriend and I are currently TTC, but also have a few trips planned for 2019, including a cruise and a trip to the Smoky Mountains which will involve a 4hr flight each way. *If* we’re successful sometime soon, I’d be about 3 months pregnant on the cruise and 5 months pregnant on the trip to the Smokies. So my question to all the moms, what’s it like to travel while pregnant? Were you miserable and exhausted throughout your trip, or were you able to enjoy travel during your second trimester?