Just because we lost children doesn't make us any less of mothers. I have my days when I question that but then I remind myself that if someone lost a 10 year old, they would still be a mother. We have our hopes and dreams for the babies we lost, the other mothers have memories.
I think keeping the things you bought for Mason was very practical and could have been a source of comfort. I read many blogs, informational packets, books, etc that told stories about women coming home after a loss and their family would have packed everything up or taken it away. My husband was going to do this, but after reading Hello, Goodbye he decided against it. Out of sight, out of mind after a loss is an outdated way of thinking. I am glad he did because having things we bought for Gracie around the house helped with the healing, I think.
I understand your fear about this pregnancy. I think once I am pregnant again I will freak over every little ache and pain or minor symptom. My only suggestion is to enjoy this beautiful time. It will be over before you know it and Rainbow will be here. (((hugs)))
Mommy to Gracie- born at 25 weeks 03/15/11, 11 inches, 1.1lbs, and absolutely beautiful. Became my sweet angel the next day.