Hi there. Very similar story to mine.
I had 7 mcs in total over an 8/9 year period.
Was referred to a specialist msc clinic and like you, had multiple tests all came back within normal limits.
No reason for them.
They were convinced that it was my age and that I was producing poor quality eggs. I was late 30`s.
I turned 40, had a further 2 miscarriages and we finally accepted that our 9 year old would be our only.
We gave up.
I visited my GP following a particularly awful miscarriage and asked for contraception.
Strange, completely bizarre as I had never even considered contraception after actively trying to conceive for so many years!
I was prescribed the pill. I needed to start to take it one the day that my period arrived apparently.
So I waited patiently, feeling more and more unwell.
As I never bothered to write dates down, I had no idea of my cycle.
What was the point,I just continually miscarried in my opinion.
So, feeling dreadful I got myself off to early pregnancy assessment unit......they knew me well!!
I just wanted a quick scan to confirm that I still had retained products from my last miscarriage, it was a particularly horrific one.
Anyhoo, there,on the scan screen, was a baby. A healthy, moving, heart beating baby of 7 weeks gestation.
The first one in nearly 10 years.
So, at 43 I had my boy.
I have a 12 year old and a 2 year old.
I'm knackered, absolutely shattered but unbelievably amazed every moment of every day that I look at him.
Magic happens op, xxx