Both of those schools will ding you. Take the LSAT over again and beg in an addendum that they disregard your initial score. Honestly, how could you do that badly? Most schools will average the scores, but if there is a significant difference (typically 10 or more points), then some will take the higher score. Northwestern, I'm pretty sure, will always take the higer score. In any event, you absolutely need to take the October LSAT and you should probably try studying or something this time.