Hi
I don't have answers, but can empathise - MCs May and June, 7 wks apart. It certainly doesn't feel random. I've read as much as I can on-line and there really isn't an explanation, just the idea that its bad luck.
I'm probably just re-hashing what you've read, but (from memory of googling) I think 4-5% of couple trying to get pregnant experience 2 consecutive MCs. From what I can tell, even after 3 consecutive miscarriages, where investigations are undertaken, only about half those get any answers.
Everywhere confirms what Jollyb has said, the chances of the next pregnancy being successful are high, and nearly as high as someone who has never miscarried.
I had a list after 1st MC of all the things I did wrong and it briefly made me feel less vulnerable and more in control. They weren't what caused the MC of course. You aren't doing anything wrong. My GP very patiently talked me through the science of what happens at conception and what can go wrong with a pregnancy and how amazing it is for any pregnancy to be successful. Felt like nothing different to what I'd read but it really helped.
I've ordered a book by Lesley Regan called "Miscarriage: What every Woman needs to know", mainly so I can try kick the terrible relentless googling re TTC/MC etc. Haven't got it yet but it was recommended by another poster here who has been helpful on people's MC threads.
I've just had BFN and preparing to try again. Difficult to feel hopeful, but hard as it is to believe the odds genuinely are good.