Be careful KADmom - our letter of recommendation got in before the application and when we sent the application in we were initially rejected for incompleteness, DW sent an email stating that it had been sent in early (by its author) and we then got a reply on 3/28 stating that our application was complete and we would get a confirmation shortly.
We waited. And we waited. And we waited some more. Eventually after April was over we inquired and found to our horror that our application had not made it into the April pile. We now have to wait until the end of this month (cry). My advice is try to find out what 'pile' your application will be in once you get confirmation that they have everything.
We had naively assumed that because everything was in by 3/28 that we would be in the April pile - how wrong we were...