Ring the school op as others have said and arrange another time, 2 weeks is not enough time to arrange a sitter you and your child have never previously met.
There are loads of suggestions but i would never use a neighbour or even be able to ask if i knew them, ask a teenager or lots of the other suggestions.
I do agree op what people say about needing some support for emergencies or if you end up in hospital is correct, its something i worry about and sort for the future.
It hard if your not a person who makes friends easily or like me extremely cautious of family let alone strangers.
Some people on this thread cant imagine that another mother may have no friends or none that are close, no family, children truly have no other parent( could be dead, in another country, in prison or escaping abuse), that sitting services dont cover your area, that you dont know you neighbours, that you child didnt attend nursery school, that you cant afford a registered sitter and umpteen other things.
Contact the school, i think they will be more understanding than some on this thread.