Hi Katherine - start the first day of your bleed as Day 1 and then when you get to Day 25, stop the utro for 3 days and hopefully you'll get another bleed. Don't worry if the bleed comes later - you can still start Day after Day 28 even if your bleed hasn't come - because sometimes after a while women don't bleed on this regime (depending on where they are in menopause, and their oestrogen dose, as well as their womb condition), and it is important to make sure you continue taking it. If you end up always being a week out then you can tweak it but to start with - take it as above.
Good luck and let us know how it goes!
Hurdity x