FMP Nano, Week 2

So, ok. Here we go.
Nothing terribly dramatic this week. At present, we are at 15,765 words, which is 735 ahead of schedule. Awesome so far, right? Yeah, maybe.
See, I think I ran headlong into a problem. I don’t know if I have enough story to hit 50,000 with BGC. Bear in mind, lest you think I’m short changing the story, that BGC arcs 1-3 already clock in at over 65K words. The arcs tend to average 24K words each.
Which is kinda the problem.
I’m not sure there are six arcs in the story. It might end at five. (Waiting for the obligatory joke about bubblegum popping).
Never fear though faithful Internet! I have a cunning plan.
Should BGC conclude below 50,000 words, I have an awesome short story idea that will be thrown in gratis.
Does it break the laws of Nanowrimo? Like Han Solo stepping on an Endor twig, but that lead to cool things too, right?