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Uterine bleeding can come as a side effect of the hormonal treatment, or through primary problems in the uterus such as endometriosis, myoma uteri, or rarely, endometrial malignancy (this last problem may also be a side effect of hormonal treatment).
To settle this issue once and for all, I suggest that you discuss with your gynecologist regarding doing dilation and currettage (d&c) to examine the endometrial lining. If this is still non conclusive and you continue to bleed, some doctors would recommend to surgically remove the uterus (hysterectomy) to prevent future bleeding.
Regards.