Yes, the spots on the back look a bit like some stuck shed. If it will stay at 72 for now that should be fine for you, usually 70 is optimal during shed time, for the few days you will be gone it will most likely lower again slowely, so having it on the higher end of the acceptible range for now wont' hurt. Plus, even if it stays just above 70 so long as its warm enough you should be good until Friday as well.

Good luck!