I need some positive reassurance that a successful pregnancy can happen for me.

I am on my 3rd miscarriages. This one at 6 weeks almost 7 and the other 2 were around 5 weeks. It raises flags that it's my third in a row and I need some stories on successful pregnancy after a miscarriage even if you only had one and how long after your miscarriage was it. Also if you have some info on what it could possibly be the reason for the miscarriages it would be appreciated so I could ask my doc to check. I got blood work done to see if my blood is clotting and it was negative. Once this miscarriage passes I will be going in to see if I have a heart shaped uterus. What else could I check for? Thanks!