Answering just for myself, I wouldn't put off trying to conceive to plan around a vacation. The way I see it, it could possibly take many months of trying and I wouldn't want to give up a number of months worth of chances just for a trip. Everyone feels differently when pregnant, you might feel poorly or might feel normal in your first trimester. I was really tired; but that's me. If you do get pregnant, you can always move your trip to a different date. I'm sure you'll get lots of opinions! Good luck!