NaNoWriMo Trouble

So, I finished my NaNoWriMo novel...the plot that is. As it turns out, I way underestimated my exposition, and so i only sit at 29450, rather than the 50000. so now I have to go back and add onto some sections and maybe majorly revise a few things to get the words I need. I suppose it's good because I get to add a little extra substance that I get to revise in december. I guess I'll just have to follow the NaNo code: that is, write. After all, if I just keep writing what I need to over the next few days, I'll get to where I need to bed. So yeah, any thoughts?