Trends are not the same as sales:
Some stores, e.g. iTunes, provide us with trends (i.e. estimates) 24 hours after the music has gone on sale. However, it takes a further month or more for us to receive a sales report from them. We collect the sales reports, check and then credit your account on the 1st of the following month.
Feel free to check the last date billed by clicking on "Sales reports" > "Stores" or have a look at the more detailed CSV of your sales reports, which will show you the stores that have delivered their sales reports and until which date. You can then compare this to your trends.
Some stores take a lot longer to deliver trends and sales reports; our average wait time is three months. We appreciate your patience.