I've published my novel a couple of weeks ago. Yesterday I had an ebook order appeared but there's no increase in my royalties for any region. Does it usually take a while for royalties to appear?
As I've only sold 6 books prior to yesterday I know exactly what my royalties were. My novel is priced at $2.99 and £1.99 (uk) and I'm not on kdp select if that makes a difference.
Orders are orders. They do not become sales until the credit card clears, which (for an ebook) usually happens within a day, but can take longer, especially for overseas sales, and especially on weekends. Only completed sales result in royalties appearing below the graph.
It's also possible that you did sell a book, but at the same time an earlier sale was returned. Your month-to-date report (look above the graph) will show this if so.
Read the thread on the General Questions forum, "Know your Reports & Sales." It will help you.
Just looked on my month to date and it doesn't report any returns. It still says 5 ebook sales (my sixth was a paperback) so you're probably right that it's waiting for a credit card to clear. I know when my Mum bought a copy it appeared almost instantly on royalties which is why I presumed it would do again. So maybe it's my first overseas sale, which is quite exciting in itself.