Which route to take?

I'm currently in my last 2 semesters of my bachelors degree in biology. I originally planned on going to Physical Therapy school, but a career in nursing has caught my attention. Should I go back for a ADN or try for an ABSN. I would like to start working as soon as possible, but I would like to learn as much as I can. I've read that its impossible to work while in an ABSN program.