I'm sorry you missed out on this years trip

If it were me and it were right now, I'd book the trip. When I first started TTC, I would have avoided it, but now that I've been at this 10 months with no BFP in sight, I'd say stop living in the "what If" world and live for right now. I've learned to stop putting parts of my life on hold for TTC.
Is there any way that you can get like a Travel insurance where if you need to cancel or reschedule your trip you won't suffer a major monitary loss? I'm pretty sure that I've heard of some places/airlines offering something like this, but I'm not positive. It may be something to look into!
I do hope you get your BFP asap, but I would personally plan on the trip... who knows what the next few months may bring!!! Good luck!