Are Primay Key Autonumber Fields Chronologicaly Ordered?

Rephrasing: I have a table that has a PK that is autonumber. As I add records, the PK number always increases, with the last entry always larger than the previous (but the PKs may not always contain the next number in the sequence, e.g. 2,4,6, instead of 2,3,4). I need to do a query on this table to get fields from the most recent record that was added.

So, If I do a sort on the PK field and get the record with the largest primary key, am I assured that this is always the most recently added field????

If not, how can I construct a query that will provide me with the most recently entered record?

Why I need to do this: I do a query on table 'A' and then append one record from A to table 'B'. Then, using the record I just copied, I do an append query on another table and then place those results in yet another table.

Or, is there another way to accomplish this?
Thanks
J