Wish I could advise but waiting for a hysterscopy myself, following post menopausal bleeding, which I’m hoping is being caused by HRT ( but I’m not so sure right now! )
At 52, you are not too old for periods.
If you have a womb, get periods AND on oestrogen, you definitely need progesterone cyclically, to shed the lining.
If post meno (a year without periods) AND on a continuous regime of oestrogen and progesterone, then in theory you shouldn’t bleed. However, oestrogen stimulates the womb lining and if the progesterone doesn’t do its job correctly, then you get a bleed. The coil is meant to be good at keeping the womb lining thin.
It’s hard fo know what the womb thickness should be in peri, but I’m imagining a lot thicker than someone who is peri?
Sorry I can’t be more help.
🙂