Hi Telly Tubby
School hols are three full weeks away in WA but I would just let the school/s know that you are no longer available (or the agency). They don't mind- they have a list of people to call on. I will be 34 wks at the same time as you but am meant to be teaching the rest of this term but it is getting hard. It is a demanding job where you can't sit down much and many people want constant attention! So don't feel guilty! Take care.