Hi,
First of all, don’t worry. I have had two ultra sound scans in the past three years, when I had bleeding episodes on HRT, both which showed thickened lining and fibroids and when I had a hysteroscopy, I had no lining ( atrophic) and no fibroids. I asked why the scan showed something completely different and was told they can be wrong or the womb can become distorted on a scan. You won’t know what is going on until the hysteroscopy. When I’ve had each hysteroscopy, they still haven’t known while I bled.
I too have had yet another episode of my bleeding, my third now, after being on HRT for three years in total now. I’ve got an ultra sound scan this afternoon….I'm expecting the same thing - and I now have a mirena coil too ( before I was on utrogestan like you) I bled for a year after I had it fitted and I was told for some women, this can happen, so I didn’t worry. The bleeding had stopped for the past 6 months…the very experienced female gynaecologist who fitted it told me that ‘women bleed on HRT’ like it was just one of those things. However, in our cases, we do have to get it checked out.
I take ultrasound scans of the uterus with a pinch of salt now, due to my experiences. So try not to worry and wait until the results of a hysteroscopy instead.