I'd go on the trip (are you in Europe?) and try your best to enjoy yourselves. If she's crampy at all, then, yes, I'd stay home and watch the cramps, they get more severe with ectopics and as soon as that happens, then go to the hospital.
Especially if there is spotting.
I have heard of betas rising so hang in there, hope for the best and prepare for the worst (that's what got me through 7 collective years of IF)
hugs and keep us posted.