I am a 60 year old post-menopausal woman. I have thickening of the endometrial wall (14 cm). After one negative biopsy and 3 months of no change in the thickness the Dr. put me on 10 mg progesterone 1x per day (about 3 and a half weeks ago.) After 2 weeks I started bleeding… heavily, which she had said could be a side effect of the drug. We've done another ultrasound and another biopsy (waiting for results). I am still bleeding after 10 days. She has told me I can stop the progesterone pills "for a few days" in order for the bleeding to stop.

When I have a full "clean day" do I do a hefsek taharah? Am I counting 7 clean days for immersion? Was all this hormonal bleeding "Niddah Blood?" I was told six months ago when we asked a sha'alah of our local Posek that the bleeding that was the result of the first biopsy was not "Niddah Blood" and immersion wasn't necessary. But this feels more profound and I'm not sure what to do…