Call your lender right away and tell them what happened. Unless you keep not paying your payments, they won't foreclose on you. If you're in a deep hole, and feel you need to sell, try to stay out of foreclosure, borrow from relatives or against your 401K to stay current. Your sale will be much quicker and smoother that way. Do you think you are under water? Ie. do you owe more than your home is worth now?