There is a right time for everything, if you miss it by a week you may miss the oppurtunity that should have been yours. It passed you right on by. Now, on the other hand, you could have been there at the right time for said oppurtunity and scored big. Is this luck? I doubt it. You had what was needed when it was needed.
Some people say,"You are so lucky" when you score that big position. Luck had nothing to do with it. You had the skills the company needed when they needed it. I don't feel luck is the factor but more in the timing of the oppurtunity. As earlier said, if you would have been a week later, that oppurtunity would have passed you by.
I don't believe in luck, some people do. I believe in seizing the moment, if you don't the moment will pass you by, lucky or not.