Congratulations.
It's not surprising that it takes a few days for the program to sort out contracts for everyone and send them out, so don't panic yet. You should make sure the program has your full, correct and up to date contact details, and could contact them towards of next week if you haven't heard anything. explorertx's quote says that you are released from your obligation if you don't get a contract within two weeks, but as you don't want to be released that is irrelevant: the program is still bound to offer the contract even if they don't get it out within the 10 working days, and I doubt the AOA is going to worry about a short further delay - after all, it only concerns matched students who want to attend the program so who is going to complain it's a (pretty technical) match violation?