I'd suggest that you add a DateTimeStamp column, of DateTime data type, to your table, with a DefaultValue property of Now(). You don't need to show this in the form, but if you base the form on a query which sorts the records in DateTimeStamp order you'd simply need to move to the last record in the form's recordset, which you can do in its Load event procedure.
If you wish to sort the form other than in DateTimeStamp order you'd need to use code to find the record with the MAX DateTimeStamp value in the form's RecordsetClone and navigate to it by synchronizing the form's Bookmark with that of the recordset.