If I can give you any advice right now, it would be to take time for yourself and let yourself grieve and lean on others.
Seek counseling if you think you need it.
Everyone grieves differently and at a different pace, so be gentle with yourself and have patience. It will hurt intensely all the time for awhile, and then you'll get some times of peace in between times of sadness. Gather all the memories you can now, while they're fresh--save everything.
You'll always miss your baby, but it does get better, and your memories will become more comforting.
By K, who lost her first baby at 18 weeks.