No judgement, just surprised that you didn't research the K-1 more thoroughly.
You cannot leave the US without either a Green Card or AP. If you do, the process will be abandoned, and you will have to be petitioned for a new (spousal) visa. The USCIS timelines for both of those processes are available on USCIS.gov, but I very much doubt you will have either one three months from applying. Our GC took 14 months, and AP/EAD took 4.5 months, but that was when it was "fast" in 2018/19. YMMV.
Just like it is impractical to make concrete wedding plans with the K-1, it is not practical to plan/pay for vacations until you have AP or GC. These things are well known drawbacks to the K-1 (as is being unable to work for 8 months or so), therefore for most/many, the CR-1 is a better choice. In retrospect, we would have chosen the CR-1, although K-1 wait times were MUCH shorter than now.