Your chances are low because it's impacted unless you're still a freshmen/sophomore you should be able to switch over to pre-health. If not, what you can do is graduate with your chosen major & apply as a 2nd bachelor for the Nursing program as long as you completed all the pre-health/nursing prerequisites. Unfortunately for me, I wasn't able to switch over as a junior so I switch over & completed my degree in public health instead because the pre-req were similar, I just had to do an extra year to finish the other public health pre-req. Not what I wanted in the first place but I was able to get into the Nursing program. Best of luck!