Literally one week left on my probation, and this morning I overhear them talking about a new hire. I really hope this is just me being paranoid.
ETA - OK, it's now Thursday and I'm still employed. Next Monday is the annual staff summer BBQ, and I can't see them being cruel enough to drop me immediately after, so if I get through tomorrow without being told not to bother coming in Monday, I'm probably all right.
Reiterating that this is probably just needless anxiety on my part.