Im 18 and pregnant?!

I went to the doctors a few days ago and they told me that I'm pregnant! I'm not sure who the dad is, but its between two guys. Neither of them know and one of them I have no way of contacting. My mom is pressuring me to keep the baby and let her help me raise it but that is FAR from what I want.. I want to get rid of it but I need help making this decision :( Im only 18, a freshman in college, and I want to become a doctor but keeping this baby would mean giving up my entire life plan and carrying it would mean being out of work for three months and I really can't afford to do that