Has this happened to anyone?

I am 32 and a mother of two boys age 8 and 2 in August. I was pregnant again but lost the baby this past May. I found out at 12 weeks and the baby died two weeks prior. I had a missed miscarriage. I had a D&E to remove my little peanut. All my tests came back normal and against my wishes the baby's tissue was tested and that also came back normal. There seems to be no answer or connection as to what happened. I can't wait to try again but I'm also terrified this will happen again. Has this happened to anyone? Did you try again and have a successful pregnancy?