Foreign travel: when to report

Hello. I have a clearance with the DoD, and have for multiple years now who has never traveled internationally. A friend recently pitched an idea of taking a trip internationally in 5 weeks to me, and I’m interested, but I realize that is in a short amount of time.

I have a few questions:

1. I’m aware that I am supposed to give my FSO a 30 day notice. How bad is it if I only give him a 3 week notice, since I am unsure of whether I will actually take this trip.

2. Would it be very bad to report that I am potentially going to take this trip, but then I never actually take it?

When should I report this? The moment I’m sure I will be taking this trip, or right now, when it is not finalized.

What should I do if it isn’t finalized 30 days before I would be leaving, should I just abandon the trip at that point, or is it actually not that important when you report to your fso as long as you do it