What would you do?

My DH and I have been ttc for almost a year. The main reason that we know of right now that we have been unsuccessful is that I've only had a few cycles since going off of bc last March. My most recent cycle was started from a prescription of progesterone and this week should be my fertile week!

My grandfather has offered to take our family to ireland again in September (he took us last September also). My DH and I are very excited about the trip, however if I were to get pregnant this cycle, we would lose out on the trip as it would be extremely close to my due date.

My question is: would you pass up an opportunity to maybe get pregnant (since my cycles have been so rare) and go on the trip, or continue ttc and possibly miss out on a great vacation??