What kind of HRT would be best?

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I've decided to go on HRT however I'm not sure if the HRT that I'd get prescribed from the NHS is just a standard one size fits all prescription. I'm 44 and in peri menopause (symptoms + blood tests where one of my hormones was high; I can't remember which one as the blood tests were some time ago). However I do believe that I have low progesterone. Blood tests in the past have confirmed this, although this didn't show up on the last test, or at least the GP didn't mention it. I've also had 5 miscarriages in the past and the only pregnancy which stuck and resulted in my little one was where I was supplementing with progesterone. This prescription was advised by a consultant at the early miscarriages clinic due to a study that said that progesterone may have positive outcomes on pregnancy and prevention of loss.

So I'm unsure if I'd need a type of HRT that gives me extra progesterone? Can any women who are knowledgeable in this area maybe provide some thoughts?

You would use the standard dose of progesterone in any hrt.
Low progesterone is due to not ovulating, (or an incomplete cycle) so you don't need 'more' on HRT because HRT recreates a 'cycle'.

But I was ovulating, and getting pregnant. My cycles were bang on 28 days.

I'm probably misunderstanding this, but don't we have a set range of progesterone within our bodies? So wouldn't I need more via supplementation than most women as they have a higher starting off point of progesterone than I do? Or does progesterone levels not really matter anymore now thst pregancy isn't something I'm trying for?

HRT is used to relieve menopausal symptoms. It's the estrogen that does that but progesterone has to be included to protect the womb lining - it can overgrow if only estrogen is used, because most women start having irregular periods and won't produce their own (as they're not ovulating each month.)

That means they aren't producing their own progesterone (when progesterone drops at the end of a cycle the womb lining shed=periods. I expect you know this- sorry!)

There is no need for progesterone as part of HRT except for this reason. Women not on HRT don't have any natural progesterone once their periods have stopped. So most women aged 50-ish to 99+ have no progesterone.

Progesterone in fertility treatment is used to maintain the womb lining to the point that the embryo will implant and grow.

That's not the case with HRT.

@JinglingSpringbells thank you for the explanation, that makes sense.