There's another girl in this subforum who had a miscarriage awhile back and she still mourns her son. She might be a good person to talk to, I think she has a thread in here... ah, here we go:
http://www.gaiaonline.com/guilds/viewtopic.php?t=6551809You could also make a tribute, something to look at that will help you remember your baby. A signature for Gaia, a picture, a story, a drawing, something of your own creation.
As Lorien said, you can have another in the future and love that baby enough for two. There's no rush to move on - grieving is a natural process and it takes however long it takes. Congrats on seeing a therapist, that's a really good move on your part.
smile Lorien's suggestion of support groups might be worth looking into too if you want some extra support.