Hi boomerang - if your periods are regular I am wondering why you are taking HRT in this way - presumably you have started getting hormonal fluctuations heralding the imminent start of peri-menopause proper ( when your natural periods become irregular), and the oestrogen is helping to cushion the blow?
Perhpas if your bleed is delayed you have in fact started peri-menopause proper and as you say the Utro is not bringing on the bleed, and your own delayed cycle is overriding the HRT?
One alternative as you are still young and periods regular is to take one of the contraceptive pills designed for menopause ie QLAIRA or ZOELY. as these contain estradiol, the same oestrogen as in oestrogel and bio-identical with our own. This would mean you have a regular monthly bleed. The progestogen in QLAIRA is dienogest which I understand is one of the latest types of progestogen and apparently well tolerated. This is taken for 22 days but the product is formulated so that your cycle is suppressed (no ovulation) and the dramatic hormonal fluctuations are eliminated. May take a few cycles to settle. Just a thought?
On your current regime, it's tricky if your periods are becoming irregular - but you could try your suggestion, say for one cycle and see what happens?
Hurdity x