Thank you ladies for your prompt and reassuring replies.
I have had a monthly bleed since I started on Evorel 50 patches in June 2019. (I had spotting before this on Evorel Conti). When the Evorel 50 patches were unavailable at the beginning of January 2020, I was given Evorel 25 patches by the pharmacist as an alternative. The next day I began bleeding more heavily, and had a constant bleed for about five weeks, day and night with clotting. I saw a nurse practitioner at my local GP surgery in early February,(stellajane, CLKD) and after researching HRT patches she informed me by phone about the risk of cancer, and recommended the Ultrasound scans, abdomen and vaginal (Hurdity) which I had last Saturday. The results of the scans show that existing cysts have doubled in size and the endometrium has thickened. However, CA125 levels are at 20, so that's slightly reassuring.
Note to Sammiejane, I'm 63 years old and post menopausal.