I am so very sorry to hear about your loss.
I myself have lost two babies to miscarriage and those experiences changed me forever. The second one, for which I had to have a procedure done, especially changed me.
The best advice I can give, years and years down the road from where you are tonight, is don't let others tell you how you 'should' feel. People will say, well, to put it honestly, a lot of stupid things because they don't know what to say. But what is worse many may say anything at all, and will try to brush over the loss as if the baby wasn't real. Don't let them do that to you. You have every right to grieve, and you are no less a mother to this baby than you are to any of your other children.
Because I didn't mourn properly at the time my miscarriages happened- I shut it all up inside, I had to deal with it later. However you have to deal with it, (in my case, it was learning to live with it, it has never been something I was able to 'get over') do give yourself the time to do so, if you don't the sorrow will be waiting for you at a later date. Do not hesitate to seek counseling from a doctor, therapist, hospital chaplain, or other minister, or anyone else you feel will be a safe source of comfort to you.
There is only one book I have ever found that was helpful to me- it was called Miscarriage: Women Sharing from the Heart and it helped because it had so much from different women who all handled the loss in different ways. All the rest of the books I have read in the past sixteen years (and yes it's been that long since my first miscarriage- but I still think about it) have seemed insulting to me, personally.
Some people grieve more, some less, nothing is 'right' or 'wrong'. Mostly, please just be kind to yourself, and surround yourself with as much support as you can. I have visited some different forums for support on this in the past- but not for a long time. Each one has a personality- like any other internet forum, but if you browse around you will likely find one where you can find the support that you need.
My thoughts are with you and your family tonight. I'm so very sorry.
Laren