I was prescribed Gepretix too, its a cheaper alternative to my usual Utrogestan. After 30 days on Gepretix I have a full blown period with swollen, sore breasts, bloating, period pain, having not had a period in 3 years.
GP (via econsult/text) said its the same as my previous prescription and has requested a scan to check thickening of womb lining or thinning vaginal walls. I have been absolutely fine until the change of progesterone.
I know Its due to that but GP airing on the side of caution.