I had a miscarriage, and I want another child, but I don't know if it's the right time.?

Hi there. Well I got pregnant when I was seventeen. It was an accident, and I was so scared. But as time went on, and I saw my child on the ultrasound screen, I fell in love with her. She was due June 16th, 2010. Her name was Annaliese. We loved her so much. On my fiance's birthday, we lost her. I was almost four months pregnant and I lost her. The doters said it was just a genetic abnormality, but that doesn't make it hurt any less. I'm 18 now and in college. I live in an apartment with my fiance. Things in my life are really looking up, but i can always feel her absence. I cry every day. I miss her so much. My family wasn't very supportive of me, they told me it was for the best because of my age. They told me I would have been a terrible mother. I know that I'm young, but I just don't know how to keep living knowing that she's gone. I want to try again, because I feel that it will be her, just in a different body, but my family says they'll disown me if I do. I can't talk to anyone. I'm completely alone and I need help. I don't know what to do anymore. I think of suicide every day because I want to see my little girl. I just need someone to tell me what I should do, or at least someone to tell me that I'm no "overreacting to the whole thing". I never pour my heart out like this to people I don't know, I just don't know where else to turn.