Oh I am so sorry

I know that it all seems scary. How far along do you think that you may be? Can you talk to you mother about it? I know that seems scary and for a little while she may be shocked and hurt for you (sometimes they express this by getting angry) but eventually she will be supportive. I know very few mothers who aren't no matter how bad your relationship may seem with her. Or can you talk to a counselor at school? I think that talking to some one and having them just be factual can help. Even if he doesn't want to be there for you, I promise that you can do it and you won't be alone. It seemed overwelming to me at first also, but then your love for your baby gives you strength and you just do what you have to do to be a good mommy.
Hang in there and let us know what happens.