I was also put on Utrogestan and Oestrogel 2 months ago because the HRT I was on wasn’t available - my previous HRT (Cyclo- Progynova 2mg) gave me a light bleed each month like clock work (20+ years!) however being on Utrogestan I have not had a bleed at all, just as you/ other post put that had some cramps only.
… I am not surprised I am having no bleed as I was advised that Utrogestan keeps the lining thin negating the need for a bleed to happen, ok I thought it might take a couple of months to kick in, but seems immediate - not concerned etc