It's natural that you should bleed though Lynne. You have a thick womb lining and it is five months since your last period so, although a bit worrying for you, it seems that what needs to happen is happening? The problem comes when the womb lining builds up and doesn't shed. If you had gone years without a period then I could see this would be much more of a worry. It seems as if you are one of the women who continue to have periods later than the normal 54 so you are not "text book". Think of the bleeding as a good thing if you can - you are reducing the lining which has to be of benefit to you.
Taz x