It's hard to tell from such a short snippit.... record the rest of the tune.... if it's too close to another song, no one says you have to move forward with it. And there are tunes that might sound like they are copied from something else..... but they are not.
Several people here thought my tune Emerald Eyes ( on my sound click page) was similar or a copy of something else but no one including me could ever find a tune that was actually close enough to say "that's the tune you copied"..... so go ahead and record the tune.
however, 13 seconds is the ideal intro length, so based on that, you're off to a good start.