Marco,
First of all, I am hoping that you will be a man and stick by your girlfriend and your unborn child. Second, you may want to use the resources in your school and go to your guidance counselor. They may be able to point you in the direction of some local employers who may be able to work with you and your schedule. Remember to be a responsible student and employee. If you feel that you are getting behind on your school work, you need to ask for help. Third, you may want to consider that you have to be honest with your father because you can not hide that she is pregnant for very long. You must sit down with your family, and discuss the matter in a calm manner, maybe you could in the presence of a school teacher or your priest. At least then you know that nothing can happen to you, at least not at that moment.
I hope that this may help you in a mature way.
batton314