Is your property for sale? If so, is it with a real estate agent that sends their listings to Trulia?
If you're property isn't for sale and you're just looking to see if it's online (for example, searching for an estimated value), then I'm not sure if you'll find it. Most websites that have homes that aren't currently for sale get their info of them either through public records or previous sales or possibly for sale by owners. Even then, it's pot-luck if yours shows up as they pull their data from various sources and it won't automatically include every property.
I'm not sure if Trulia even pulls info about homes that aren't listed for sale.