I'm in NSW but was in the private system, so perhaps a little different. I finished on the last day of the school year, but was due mid-January. I was paid for the school holidays and THEN my maternity pay started. As it happened, I had my baby a week later (4 weeks prem) but it made no difference as to how I was paid.

If you're only a temp, I suspect it's holiday pay and nothing else.

BW