I think you'll just be "out of status" for a couple of days, but I don't think it matters as far as your AoS being successful, but being out of status is never ideal. I don't know how current this is but: http://www.visajourney.com/faq/k1k2visa-aos.html#6.1
There's a few threads about it kicking about if you google, this one is quite an old, but meaty, discussion on the topic;
http://www.visajourney.com/forums/topic/256475-aos-for-k1-visa-holder-after-90-days-from-entry/
and some others
http://www.visajourney.com/forums/topic/438631-acceptable-timeframe-for-filing-aos-k1-after-marriage/
http://www.visajourney.com/forums/topic/404428-applying-for-adjustment-of-status-after-k1-visa/
