It doesn’t seem likely that your tubes have become untied. Even if this did occur, it wouldn't manifest with bleeding between menstruations (spotting). Rather, untied tubes can manifest with an unwanted or unexpected pregnancy.





If the patohystological report of the endometrium reads ok, that means that there is no organic reason for the spotting: tumor, infection, hyperplasion… therefore, the blood that you are experiencing in between cycles could be functional in nature. Functional spotting is due to a hormonal imbalance. You can consult your gynecologist about this to request further diagnostics and to learn about treatment alternatives.