Are There Natural Ways For Abortion?

Hi! my and my girl friend had sex in the first week of January 2011. She had her period in the last week of December 2010, probably, 24th or 25th of December. Its 2 Feb now, she didn't had her periods and we are afraid of pregnancy because we are not in a situation to handle this. She took ECP medicine before 24 hours of sex. please tell me what can be done if she gets pregnant. Is there any way of natural abortion or is she fine and going to have her periods?