A miscarriage and unanswered questions?

Right now I am dealing with a miscarriage. And I feel like I am not going to have the answers I need till my next doctor appointment because she wanted me to get through the miscarriage before we talk about what went wrong. Its not for 3 weeks. And here I am with just my thoughts. Here is the cause of my miscarriage- An embryo that tried to split at 6 weeks into pregnancy. I have found nothing on the internet about this. It is driving me crazy. I wish my doctor would of told me how this happens. Who knows she might not even know. Has anyone heard of this?