A.R.
In my opinion, you don't have to "keep it together". You lost a child and have a right to grieve. If you had lost a 1 year old, no one would expect you to have it together. For some reason, people are not as tolerant about a miscarriage. Take the time you need to grieve.
There is probably no good reason that this occurred. Instead of being a child that does not have 10 fingers and 10 toes, it was missing a vital organ or hormone or something necessary for survival. The medical profession still does not have answers for these questions.
When I had my second miscarriage, we planted trees in our backyard for both babies. We had the ashes from the second baby (but not the first) and spread them in the ground where we planted the trees. My husband had my daughter help him plant the trees. She talks often about the trees that we planted to remember the babies. We even decorated them for the holidays - we hung pine cone bird feeders, popcorn strings, and sliced oranges on them for the animals. We have talked about decorating them this spring also. In my opinion, this has shown my daughter how real these babies are. And, it has shown her how important my children are to me. For me, it was helpful to find an outlet for remembering them. Do what feels right to you and don't worry about the rest.