@Kay-Skay790
No need to worry. Basically, if you sent off a hard copy registration, and your check has cleared, it likely means I just haven't gotten around to actually sending confirmation emails to you yet. Given my current work schedule, and the fact I only have time to do most of this at work, I've been a little on the bogged down side, and confirmation emails are lower on the priority list than getting everything into the database and such.
Still, if you're concerned and want a direct confirmation sooner rather than later, I usually have time to answer questions, which can be sent to kumoripez@hotmail.com or registration@kumoricon.com - the former of which reaches me directly (and thus I can answer faster), while the latter adds a step by routing through K-con's site itself.
PezCat