When I was struggling with Utro intolerance, my specialist said it was OK to just have oestrogen for up to 3 months before introducing Utro again but at a lower dose (vaginally), so you should be fine with what you've done
The specialist menopause nurse told me this also, she said it's better to see if the oestrogen will help first before trying to combine it with progesterone which is so problematic. Sort the easy one first, then fit the difficult thing around it.
I was given ten weeks oestrogen which made me feel better, then adding progesterone had me feeling worse than baseline so I gave up on that type of HRT, it wasn't worth it.
I'm happy on tibolone.
Congrats on getting it from an online pharmacy, I don't know how difficult that was, but I get so fed up with the GPs changing their minds every five minutes about meds that mess up your head when chopped and changed about, I'd get it where I can too!