Thank you Milamam!!!
I am so relieved to hear your story, there is literally no info on the internet in relation to women in peri who are taking HRT and what an acceptable lining thickness is. I'm so grateful for your response.

Walking the dog, thank you for your reply - I'm taking Utrogestan as part of my HRT. Are you taking HRT and are you postmenopause?
Hurdity, thanks for your reply too. I was hoping to hear from you.
I am taking 43.5 mcg estradot patch (patch snipper) and 100mg Utrogestan vagianally. I started taking it 15 days of the month but my periods were a bit light so I thought if I reduced to 10 days per month they may get heavier.
The flow is heavy on day one and two then this last period it petered out to just spotting on day 3 and 4. Hence the decision to get a scan done. I just wanted to see what was going on.
I have had absolutely no problem with breakthrough bleeding and no spotting between periods.
It's just that on day 4 (period has ended by this day), I would have thought the lining should be much thinner than 9mm.
I'll definitely go back to 15 days, I was even thinking I should maybe take the prescribed dose of 200mg for 15 days.
Any thoughts?
Will increasing the progesterone help to thin the lining a bit?