I was in your exact situation when I went through UPT back in 2003. Graduated UPT on Thursday, wedding on Saturday, honeymoon cruise Sunday, returned from honeymoon on the next Sunday, departed for WST/CST Monday.
As with anything in the Air Force, as you'll soon learn, make sure you let your flight commander know. If they have enough lead time, they can oftentimes work with you on a later date for training. Doing this sooner rather than later will not hurt your cause. Sometimes they can't help, however most times they can...you just have to let them know.
Good luck to ya.