Wow... This really does sound like an afternoon talk show...

Honestly, to me, it sounds like you got involved with a good-girl-gone-bad. Remember Footloose? No one was as bad as the preachers daughter? Well, sounds like you picked the "preachers daughter" type of girl without knowing it.

One of the first things you said on your post was that you had sex with her the first night you met and it "surprised you." That, right there, should have shown you what type of girl she was. Everything else is periphery.

I'm sorry that you've figured it out the hard way, that your heart is involved, and that she is now pregnant with some random guy's baby. But hon, you knew (maybe subconsciously, but you did know) what type of girl she was. You kept going along with it. You weren't tied to her, you could have stopped it.

I agree with Tal... neither one of you are ready for a serious relationship right now. You need to figure out who YOU are. Put a hold on a relationship right now, hon. Heal your heart, get to know your own character, and find ways to fill your time without a girl. Its only then will you be truly ready - and appealing - to the right kind of girl.

Oh, and you said that if you left her she'd do something crazy. Don't let her reactions dictate your actions.