What might have concerned him was seeing you online or seeing you had been online and not answered his PM.
Shipping on Tuesday would have been 5 days that had past after payment. Unless a seller specifically contacts me and lets me know it will be late, I expect tracking info within 3 days.
If you had been proactive as a seller and communicated to him that you had a busy schedule until the following week I am sure there would have been no issue. Constant communication makes for a smooth transaction. It isn't hard to take 5 minutes to send a PM.