I have also had a similar experience with 2 missed miscarriages. They are horrible. There's nothing worse than expecting to see your baby bouncing around on the ultrasound screen, and seeing a much smaller bubba who is no longer alive.
The last time this happened to me (missed M/C #2), we'd taken our 2 year old daughter in with us for the scan (12 wk scan), as we thought all would be fine as my 7 week scan had showed a heartbeat. When I started crying, she ran to me and kept asking 'Ok Mummy?' over and over, I'll never forget that. But it meant a lot to me that she was involved, and that she cared so much for me, even though she is so young and really had no idea what was going on. It hasn't scarred her in any way, she had no idea I was pregnant (even though I told her we were going to have a new bubba). It was also nice having someone to cuddle, when DH would be at work. I am soooo grateful for my beautiful little girl.
It also didn't help when my best friend found out she was pregnant two weeks later, followed by my sister a month later. I was very happy for them, but sad that I really should have a new baby before them, and that we would all have newborns together.
It has helped me in that with all of my pregnancies I have told a few people - my best friends, my parents, sister, girls at work (which helped when I needed time off). Now that people know what I've been through, a lot of them come to me for advice.
I'll never again take pregnancy for granted!
Best of luck if you do TTC. We are trying again this month, don't know if we should be, my mum tells me to let my body rest more, but feel I'm losing more and more time (would like 4 children).