What can i do when i dont want to be a father and she is pregnant?

This is a poorly worded question but i need help. I have got a girl pregnant who told me she was using contraception and it had always worked, well i was the unlucky one. One time one pregnancy! She doesnt want to have more kids she said but now she is saying that she will have the child just to bring the heat of CSA on me when she had already agreed to an abortion. I understand the emotional side of the situation but as a man i am powerless. Or am I? can someone help me please.