na... I don't think it's a sign it could be coincedence, but yes it is an unlucky number.
Another thing that i heard is if u have three kings (spade, club, diamond,) in a card game then that would be just as bad as 666 but yet it has another meaning but i forgot what the meaning is. (jus somthing I heard from someone)
Don't become too worried, from what i had learned from my expeirences is that good luck comes from the heart and mind.