You should get an email with tracking later this afternoon. We also manage another brand that had a HUGE blowout sale last week and it's caused a pretty significant backlog.
Also, some things to remember when placing orders on Sundays - already you have a min of two days of orders ahead of you (Anything that was backlogged as of Friday, at least part of Friday, all of Saturday and depending on what time you order on Sunday - part of Sunday). all of these orders enter the queue for processing on Monday. If there was a sale, this could put you behind quite a few orders.