The vet sent me an invoice for Monday's appointment and I realized that for the first time in a very long time, I don't have another appointment to look toward. This is it. It's not going to be normal to see her every two or three weeks.
I'll probably still see her around on a regular basis, but it won't quite be the same.
It's funny how you get into patterns like that and what was once normal now seems weird and uncomfortable.