I'm in your same boat. We've been planning this trip (along the lines of a 'once in a lifetime' thing) for 4 years. Just before Christmas, we found out that I'm pregnant. It's a total shock, happened despite preventative medicines, and am due 5 days after I take the bar exam this summer. To say I was stunned and terrified is an understatement!
Anyhow, I checked with my doc, and he's actually more concerned about eating deli meats. As far as cheeses go, his only caution was to be sure that I was eating cheese from a reputable source. IE, a classy restaurant with good ratings from the local health boards.
In light of our disney trip, he's okayed me to eat the cheese plates at the restaurants, and really only cautioned me to be certain that all unpeeled fruits I eat are well washed (a woman from the practice recently got listeria from an apple!).
Enjoy your trip, and may you have a trouble free pregnancy!