Sweeetie, please, please don't blame yourself. It is a very natural feeling though, my psychologist kept telling me over and over until I believed her. When we lose a baby/child, we need something/someone to blame, and of course we look to ourselves first. The thing is, there is nothing you could have done hun. It is a very tragic thing that happened to you, but not your fault.
When I lost my first baby Joshua, I blamed myself for his passing. I went ahead with the pregnancy even though I had a very big fibroid that was living outside my uterus. I sought an opinion and was told that is was less of a risk to go ahead with the pg, than to remove a big, living fibroid. If we were to remove it before I got pg, I could have had a massive blood loss and lose my uterus altogether. So I went ahead with my pg, and then the fibroid inteferred with it, and I lost my litle boy. For a long time I blamed myself for going ahead with the pg with the fibroid in there, but then when I lost Joshua, the fibroid died during his birth, and eventually when they removed it, it was very easy to remove (there was no blood supply to it anymore) and the operation was a breeze and a total success. I then tried again for another baby with a clean slate, and now I'm due in 4 weeks.
Please be gentle to yourself, and as hard as it is to accept our loss, it must be done in order to move forward. Sometimes things are just not in our control hun. Big hugs darling