[losing touch.]

Wow.. this is a bit of a tricky situation. You need to speak to her, she can't just cut you out like that. She had sex with you.. she has to face the consequences. Not saying you're blameless here, far from it.. but it's not all your fault. But like Andrea said, if she was having sex with you she could well have been having sex with other people as well. There is obviously no way to know for sure until the baby is born and you get a DNA test done.

As for the relationship with your brother, i think you should let him calm down a bit first before trying to reason with him. He is going to be REALLY mad, and rightfully so. I'm taking it that the girl has decided to keep this baby? If so, you have a while before it's born.. but really you've got to be the one who makes the effort to apologise and try and mend this big mess you and her have both caused. Good luck though, it's never easy being a parent at any age, but especially being young.