Random Nursing Question for all on getting started

Hello all! First of all I apologize in advance for what may seem an ignorant or naive question. I am a senior in college and a recently declared Corporate Communications major.(business marketing mumbo jumbo)I work part time in marketing and am very good at it, but cant see myself doing it forever. As you may tell by the "recently declared" part, I am not sure this is exactly what I want to do. My mother is a RN of 40 yrs and I have always had this urge to follow in her footsteps but never followed through. I have come to a point being a scared senior not ready to be thrown out into the real world realizing I want nothing to do with my major. I want to follow my mother, not for her but for myself and work in the pre-natal field. The root of my question IS... how do I go about doing so with out wasting four years of my life at a very good school to do what I will be happy doing? Has anyone been in my position? I have a Friend who is in her senior year at the University of New Hampshire and already doing clinicals and working in a Hospital and she really enjoys it. I would hate to have to live a life in a career which I am very good at but dont love. Is there a way to avoid starting over? Thank in advance for youre feedback and thank you for listening!!

~Whitney:heartbeat