Losing streak, or have I gotten worse?

[Kandahar]

I've been playing the $11 SNGs on Party Poker for about two weeks now. After 92 games, I'm making an average profit of $2.46 per game. However, almost all of that is from the first week of play. From May 31 to June 5, I played 42 games and made $200 (reaching a peak of $6.02 per game). Since then, I've played 50 games and have only broke even. Is this a cause for concern that my game is getting worse, or is my sample size too small to draw any conclusion?

I've replayed my games from the week when I was winning, and don't notice any significant changes in my game play.