I don't think you are yet menopausal or using HRT, are you @JaniieJones? I'm sure you said that a while back.
I may be mistaken but some time ago, did you mention this friend of yours and say that she had a history of some bleeding, hence the scans? And therefore her GP is managing to request ongoing scans? Otherwise she is the only person I know of who can access scans as drs have to tick a box with their reason for requesting a scan.
I can't see how the thread title is confusing because the word Utrogestan is the first one in the subject line. Utrogestan is the only form of progestin that is given separately - all the others are already packaged as a monthly dose as tablets or a patch, so it's not possible to women to adjust the dose anyway.
You possibly don't know anyone taking progestins (of any kind) for 10 days or fewer. There are some and they do post on other meno forums.
It's an option there, mainly for consultants, but the paper I linked to also shows that some of the stronger progestins can and are given for 10 days, depending on the estrogen dose.
This is an extract from a paper which includes Mr Nick Panay's guidance (he leads the meno clinic at the Chelsea and Westminster Hospital and is a key researcher into menopause/HRT.)
The minimum recommended duration of progestogen required to prevent endometrial hyperplasia completely is 12 days (Sturdee et al., 1978). However, if a patient is progestogen intolerant the duration of progestogen can be reduced to 10 or even 7 days per month. This will increase the risk of endometrial hyperplasia, particularly if implants are being used, so it will be necessary to have a lower threshold for endometrial sampling should there be any suspicious bleeding. Heavy/prolonged bleeding may also be a problem with the shorter duration of progestogen
There are many 'off label^ variations on HRT which GPs are not aware of or using (the latter because they are not at consultant level and have to stick to the prescribed dose.)