Definitely try to talk to representatives from the program(s) you are interested in. Sandi's advice was excellent - try to get a one on one appointment so you can have someone help you with your
situation. You'll want to find out the policies on retaking courses. For example, does the new grade replace the old grade or do they take an average of the old and new grade, do they have a limit on the number of courses you can retake? Find out exactly what they are looking for in potential nursing students - medical experience (something my school doesn't consider), test scores, GPA in specific classes.
You can't change the past but going forward, knowing that nursing school
admission is competitive, you just need to work as hard as you can to get the grades you need to. A lot of schools
put a lot of weight on your grades in the science classes so since it sounds like you haven't taken those yet, that's to your advantage. You know that you'll need to work really hard in those classes to make yourself a competitve candidate.