emt:
The doctors I spoke with when I was applying said my experience as a nurse would be a great benefit. Most admissions committees are looking for medical experience with direct patient care. But I didn't come the same route you want to take. I didn't know I would eventually be applying to medical school when I became a nurse. It is wonderful work and I wouldn't trade a minute of it.
My Bachelor's degree is actually in music, with an emphasis in piano. All the doctors and pre-med advisors who spoke to me before i went back to school to finish my B.A. and pre-meds had this to say: major in something you like! You can major in anything, just as long as you do well, especially in your pre-med classes. Well, I love music. So here I am--a B.A. in music, with lots of pre-meds thrown into the mix. My preparation for the MCATs, besides the pre-med classes, involved a Kaplan MCAT course. Take one, by all means!
Nursing school is demanding. It may be difficult to work your pre-med classes into a B.S.N. course of study. That may be why people are hesitant.
My advice: Do what you want to do. Major in what you like. Just do your best and make sure you get in your pre-med classes. And good luck!