Roughly speaking this is true of me as well.
My periods tend to be 24-34 days apart when I'm on HRT and the longer it had to build up, the heavier the period tends to be, but I also thought changing progesterones changed the amount I bleed too.
On Evorel Conti I had a really heavy period lasting over a week, that was 15 months after the previous one!
When the gap is three months it's heavy too, now I'm back on hrt I have a period every month at some stage and the difference isn't really noticeable, they are all heavier than I'd like!
One thing I noticed is that withdrawing progesterone doesn't trigger a bleed for me, I've been on sequi since March, but if I stop my oestrogen, then a bleed is guaranteed within a couple of days, no exceptions, but I've only done that three times (before March).
