don't fret!! =you're not late--you're early, but for fall of 2014, not 2013. Most true preschools (as opposed to full-time daycares with preschool programming) won't accept kids unless they're 2.5 (in the case of St Columba, for example, 3) by September--meaning your child is likely too young for this fall anyway.
You might check out this recent post which asked a similar question--but again, most of these schools are unlikely to accept your DC this year because of age cutoff:
http://www.dcurbanmom.com/jforum/posts/list/287524.page