greendragonette, thanks for explaining, now I understand.
This is just my personal opinion and I'm not a medic but I would make a couple of observations. Firstly, I don't think it's a great idea to combine hormones ie the oestrogen and progesterone cream you used previously because it is too inflexible. I think the branded oestrogen products are good and it's the branded progesterone products that are often the problem because the dose is too high. So really I would suggest a bespoke 50mg progesterone product alongside branded Oestrogel (which you already have) having had success with it myself.
If you have a gynaecologist then she can scan you to check the womb lining ( - his is standard procedure in Spain. So yes, try taking 100mg Utrogestan vaginally every other day.
I hope it works out for you.