If you guys have an open line of communication you should be ok.
If he/she is a "runner" not answering emails, phone calls and so forth then I would worry.
But it sounds like you should be ok..
However, in your worst case scenario I do not think you can get your money back without you being the one authorized to withdraw from his/her bank account. He/she will have to send it to you willingly. This is one reason why I like to pay by credit card/Paypal/check/cashiers check. Any of those mentioned you can stop payment or do a "chargeback" to get your funds back or stopped.