Hi, while reading your post, I remember my son when he was little. He was afraid of the dark room, he said there’s a monster. I explained that it’s only your imagination, but still he was scared, eventually, he believed me.

I found this good article that says “Childhood fears are normal. Having those fears is a good opportunity to help them practice facing their fears — and practice determining if those fears were based in reality or their imagination." http://bit.ly/2lwG7zX

It helped me in dealing with my son’s fear, it might help you too.
Thank you for sharing.

I’m so sorry for your loss. Before I get pregnant, I had infertility work up for 1 year. I got pregnant and during the 20th week of my pregnancy, I had spotting, I was scared that I might lose the baby. It’s my first time to get pregnant, and losing the baby is going to be difficult for me and my husband. On the 32nd week, I had pre-labor, I was so scared and nervous because our goal was to have a full-term baby. Now, that baby is a teenager.
I didn’t experience miscarriage but I understand your desire to get pregnant. Don’t lose hope, just continue to do your part. I have faith that God will give our heart’s desire on His perfect time and He is always working in our behalf.

This article might encourage you:
http://bit.ly/2kELqR9
Thank you for sharing. You are in my prayers.