Hi Estelle
I presume you are bleeding at the "wrong" time in your cycle?
There are a number of reasons for abnormal bleeding which need specialist help to diagnose - but some of the common ones are oestrogen withdrawal bleeding (reduction in oestrogen), progesterone breakthrough bleeding (too much progesterone compared to oestrogen) and oestrogen breakthrough bleeding (too much oestrogen compared to progesterone).
Here is some info I found:
"The cause of DUB is usually related to one of three hormonal-imbalance conditions: estrogen breakthrough bleeding, estrogen withdrawal bleeding and progesterone breakthrough bleeding.1 Estrogen breakthrough bleeding occurs when excess estrogen stimulates the endometrium to proliferate in an undifferentiated manner. With insufficient progesterone to provide structural support, portions of the endometrial lining slough at irregular intervals. The usual progesterone-guided vasoconstriction and platelet plugging do not take place, often resulting in profuse bleeding.
Estrogen withdrawal bleeding results from a sudden decrease in estrogen levels, such as occurs following bilateral oophorectomy, cessation of exogenous estrogen therapy or just before ovulation in the normal menstrual cycle. Estrogen withdrawal bleeding is usually self-limited and tends not to recur if estrogen levels remain low.
Progesterone breakthrough bleeding occurs when the progesterone-to-estrogen ratio is high, such as occurs with progesterone-only contraceptive methods. The endometrium becomes atrophic and ulcerated because of a lack of estrogen and is prone to frequent, irregular bleeding."DUB = dysfunctional uterine bleeding
http://www.aafp.org/afp/1999/1001/p1371.htmlIn your case it sounds as though it could be either reduction in oestrogen, or too much oestrogen without progesterone ( especially as you haven't had any since September).
Also when women become peri-menopaisal and are on HRT the cycle is artificially maintained by the added hormones, but underlying it your own cycle may be doing its own thing with all the internal fluctuations of your own hormones - so this can also cause abnormal bleeding. Still not sure if you are peri-menopausal??
Good luck with the Utrogestan!
Hurdity x