Welcome star, so sorry to hear what you have gone through. It's just awful, isn't it? All the hopes and expectations, every time, and then they get crushed again.
And yet, we all keep trying - I think we sometimes don't give ourselves enough credit...
I've also had 4 mcs in a row, and nothing is 'wrong' with me or DH - however, mine are most likely happening due to chromosomal abnormalities... At least that was the cause for 2. Have you had your embryos tested at all?
Another thing you might want to look into is immune issues - high NK cells etc. There are many others here who now more about this than me. But there are a few places that test this, but yes, you're probably looking at private tests... What have you had tested? Did they look at clotting issues? Sorry, you might have said, but I'm on my phone.
coco that sounds really positive! I agree that it's easy to forget that there are other important things in life, too. Ttc can take over everything! Good luck with whatever you decide to do next, it sounds as if you've got a plan 
I'm currently enjoying my coffee (first and only cup, trying to reduce the caffeine intake
).
Looks as if I ovulated on CD10 this time
We dtd, but I think we might have missed the crucial days, since I thought it'll be a few more days. However, I've managed to fall pg before, having dtd only once in my 'window', so I guess I'm now in the 2ww. Sigh...