I'm in the process of extending a short story (originally about 4000 words) concept into a longer novel, which I've set myself a goal of 75000 words, 3 parts, 30 chapters, 10 chapters/25000 words per part, 2500 words per chapter. Except that so far I've hit 1919 words in chapter one, 2178 in chapter two, 1230 in chapter three, which I wasn't too disappointed with, until I managed just 820 in chapter four, meaning 6147 in total for the first four chapters, when I was originally aiming for 10000 by this stage. Chapter two and four aren't actually finished yet, but they are near the end of their natural climaxes, so I don't think I'll be adding any more than about 1000 words. I know I should just ignore my gut feeling and keep writing, but I can't help but feel that if I'm dropping below my self imposed limit this early that I'll struggle to hit the 75k mark when I get to the end of the novel. It's quite possible that later chapters will go well over 2500, so my fear is probably unjustified as I imagine it's rare that a novel will have chapters of uniform length?