So, when I called United on Wednesday evening, they told me that my bag was lost and that they would send me the reimbursement forms soon.
We left San Juan Thursday afternoon, and I was wearing all my belongings in my laptop bag and two plastic bags from the hotel. At least I had no luggage to check in this time. When I asked at the counter if there was any news the representative said they had found the bag, and that it was in D.C., waiting for me.
When I arrived at Dulles it turned out that my bag was actually just arriving from Charlottesville, another airport, and had made quite a trip in the last few days. Apparently there had been a problem with the tag attached to my bag, and it had two instead of one barcode. It arrived practically at the same time as our flight, so all I had to do was to go to another carousel to see my bag arriving, safe and well.
