Building up stamina

1,700 words today. That usually happens when I've got a scene with a little bit of action and development in it. Once I start finding the story more, I'll have days of 2-3,000 words. So far, it's really just background sketches, which is starting to worry me. I guess it's only a trap if I make the mistake of thinking it all will be a part of the book. It might be a necessary part of the process to write this, but I can't let myself get frustrated later when I figure out that it's unnecessary material. Still, I need to start tackling the actual story.