Your winrate at this point after this small of a sample isn't reliable in any sense. However, it doesn't mean absolutely nothing...this is a very good indication that you are a winning player, and maybe even a 2bb+/100 winner.
This site should give you an idea of your true winrate...
edit: sustainable winrates at 5/10 from my understanding are no greater than 3 bb/100, so basically look mainly at the minimum bb/100.