I thought you were asking if you could go onto HRT if you still had regular periods.
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If you're 56 and bleeding every month on continuous HRT that suggests either you are not post meno yet, or you are bleeding because the HRT isn't the right dose.
What are you on? Your GP should be adjusting the dose- less estrogen or more progesterone (if it's Utrogestan, 200 mgs a day not 100.)
Estrogen can make fibroids grow but doesn't cause them. Around half of all women have fibroids but never know and have no symptoms.
If you have low mood on HRT it's worth looking at the dose of estrogen and the type of progesterone.
You might want to think about the Mirena coil for the progesterone- has your GP not suggested that?
The guidance for continuous hrt is
aged over 54 - even if still having periods
no periods for 12 months at any age
on sequential hrt FOR 12 MONTHS at any age and trialling continuous after that
You will get a lot of posts here from women who aren't any of the above but they may have particular reasons for that. The guidance is there because used too soon continuous doesn't stop periods and women end up having scans to check everything is ok.