Well given you are hypothyroid and normal with medication and given your bleeding pattern - this sounds like you are having something normal going on
and it does NOT sound concerning at all so I would not be concerned.
I would suggest a pelvic exam and to make sure your PAP smear is up to day and also get a Pelvic ultrasound - if the ultrasound is normal the the 'STRIPE' of the inside of the uterus is less than 4 mm - then you do NOT have an Uterine cancer and you should be fine.
so Please do not worry
Have a good day
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