For newcomers, refill timing tends to be less mysterious than it feels: a fulfillment site swap can move the ship date, transit time, and packing slip while the actual order stays the same. My last two refills came from different hubs; the first shifted the delivery window by two days, enough to make a calm person start rereading tracking scans.
The useful habit is a four-column note — requested, shipped, arrived, days of buffer left — then compare two or three cycles before changing anything. One weird scan is noise; a repeated two-day drift is a signal to request earlier.
Keep the med details out of the log and keep the logistics boring. Anyone else tracking a transit pattern after a site change?