You don't need a bleed! Not bleeding does not mean that you are not getting enough oestrogen - you can determine this according to how you feel - flushes, sweats, mood etc - not by the bleed. If you feel OK on the progesterone phase then it's fine to carry on as you are. If it continues like this (no bleed) for some months, then your doc might suggest changing to continuous combined HRT (if you are happy to remain on continuous progesterone). Alternatively you might think of going to a longer cycle ( increasing the interval between the progesterone cycles) under supervision of your doc and if you are post-menopause.
Hurdity x