No, your property has not received a notice of default (NOD) yet. You will actually receive a letter from the bank telling you when it is. From the date on the NOD, you'll have 4 months and 20 days minimum to either pay the past due amount or sell the home. The agent who has your house listed should also be able to give you this information.
Best of luck with your short sale. Hopefully you've been getting a lot of interest based on the advertising and marketing of your home.
The Karten Group