I'd have to agree with mythicalstorm in that, in most cases, there is no element of self-blame when it comes to a miscarriage. Sometimes there is, depending on someone's activities or lifestyle at the time (even though it's usually not something that would actually cause the miscarriage, it may be something that would allow someone to pin the blame on themselves), but in most cases it sounds like there is no such element. Perhaps this helps people heal faster from a miscarriage, I don't know -- I know that my nephew died at 3 1/2 from a head injury, and now (2 1/2 years later) his mother still grieves, thinks she should have known and should have seen the signs (he died a week after receiving the injuries), and she threw away every aspect of her old life to re-invent herself in a world where he didn't exist in an effort to forget.
That said, the loss of a child to miscarriage is still the loss of a child. I know that as soon as I knew I was pregnant with my babies, I started to get attached to them. By the time I could feel them move, I started to get a sense of their personalities and thought about them non-stop all day every day. Though they were both delivered healthy, for the first couple of months after each birth I had some very disturbing dreams and woke up with profound confusion -- because the baby inside me was gone. The baby I felt every moment, whose very life intertwined with mine, wasn't there anymore. Presently the confusion would pass, and I would reassure myself that the baby in my mind and the baby in the bassinet nearby were one and the same and all was well. I can imagine that the grief in realizing that baby truly was lost would be just as profound whether it happened before they were born or after. There is still a hole, and still a lot of healing that must take place before life even begins to feel normal again.