Hi walking the dog
You can't really tell whether you are post-menopausal or not once you've started HRT. To determine this you would need to stop HRT and if you did not have a period for 12 months then you are post! I think approx 80% of women have reached menopause by age 54 which is the time many women are changed from cyclical to continuous combined HRT - although some women are changed after just one year on HRT so see what happens.
The fact that you felt extreme pmt and have had a bleed suggests that you are not yet post-meno and your own cycle is still happening. However, equally, if you are taking this dose of utrogestan orally, and your lining was already thickened - it would well be that a minor fluctuation in systemic progesterone levels (ie a fall) could trigger the endometrium to shed. Not sure if this would be felt as pms or not - but possibly your body would react to the fall in prog and give pms symptoms as well as a bleed? Do you have any digestive disturbances at all which could have affected absoprtion?
I presume your specialist advised that bleeding might occur?
Hurdity x