Received no confirmation from editor of article receipt
It's the beginning of a semester just now...lots of folks will be navigating very tight schedules.  

The answer to your question however depends a lot on the size and publication frequency of your journal, and the nature of your submission.  Put simply, the larger the publication and/or paper, the longer you should give the editor to reply.  Also if it's an infrequent publication schedule, likely the editor doesn't wade through the pile of submissions on a "crisp" pace.

If it's a well-regarded journal, there may simply be too many submissions for an editor to individually acknowledge them all.