Some women do not get a withdrawal bleed with cyclical HRT - if you look at what it says on this site the cyclical HRT tablets are listed and the following statement appears: "All the above cause a monthly bleed in 85% of patients."
http://www.menopausematters.co.uk/perimeno.phpNothing to do with your eggs, although some women may be less likely to get a bleed once they are post-menopausal. Evorel sequi contains one of the stronger progestogens (for keeping the lining thin) so this may well be more likely to happen (lack of bleed) with this type of HRT for some women once they are well post-menopausal.
I used this type when I first started HRT but the progestogen in it (norethisterone) gave me headaches and I got more pmt with it (when changing to the oestrogen only patches) so I changed to a different HRT. I haven't used Femseven but you will find women on here who swear by both of them. The main issue with Femseven is having to leave it on for a week and if I used these I would change more often if it tended to start coming loose after 4-5 days for example. However then you would need to persuade your doc to prescribe more than the usual amount!
You could try the one you've been given - give it 2-3 months before you decide whether it is working or not. If not then try Femseven - and if all else fails you can always use separate oestrogen and progestogens as I and others do!
Good luck and keep us posted
Hurdity x