38 tubes tied 12 yrs ago. heavy bleeding 10 days after normal period. possible miscarriage or something else?

Miscarriage unlikely: Since the failure rate of tubal sterilization (pregnancy 12 years after “tubes tied”) is quite low, the likelihood that your “ heavy bleeding10days after normal period” is due to a miscarriage is also quite low and can be easily ruled out. It would be best to seek a gynecological evaluation (history, physical exam, Pap test, blood count, pelvic-abdominal sonogram...) in order to be reassured .