hello katz. i think if it were me, i'd go and have a chat with the doctor to make sure it's nothing to worry about and put my mind at rest. although it's reckoned one year without a period is the end of it all (hoorah!!!!) i believe 2 years and then a bleed is probably still ok, and at 52 aswell. maybe if you were late 50's or so, and had an unexpected bleed it could be more significant.
as i say, if it were me, i'd speak to the doctor. let's hope it is your very last one. good luck.