Hugs, Megan! Sometimes our bodies just do weird things. I have midcycle spotting sometimes for no apparent reason (before O, around O, mid-TWW, whenever) and it doesn't seem to mean anything. I would just try to take it as a neutral sign and keep an open mind about AF coming or a BFP showing up soon. (Easier said than done, I KNOW

). I'll be keeping my fingers crossed for your BFP!
As far as monitoring your cycle on vacation, I have been living at home with my parents for several months, so I know it is frustrating not to have privacy. I have taken to using a small makeup/other bag for my OPKs and some small cups for POAS. If anyone asks/notices what I'm taking into the bathroom, I say I have my period. It works!
Good luck!