I went through a similar thing like u.My bf forced me to have sex and then when I told him I was scared I might be pregnant,he just broke up with me.I know its soooo sad when u find out that the guy u love doesn't care for u anymore.It's not fair when girls have to go through all those wories and guys can just shrug their shoulders and walk away.I used to cry all day and overeat myself to rid my sadness,but that never really made me feel better.
Try to find other ways to solve ur problem.If u can't talk to ur parents,talk to ur friends or if u have msn we can chat.Don't cut youself hon,u'll be hurting u and ur baby.I know u are the one who is going through all this and all the depresion and I can just give u some advice u might have heard a hundred times,but try to talk to someone about ur troubles(those u feel comfortable with,not morons)it really helps a lot.There are many girls out there dealing with the same situation and lots of them solve their problems.
Don't hurt urself sweetie.I wish u all the luck in the world and keep me informed when u get better.