i'm an lpn. Have bachelors degree but not in nursing. what rank would i be in army?

It depends on what sort of BA degree you have. Your LPN / LVN does not count toward it (unfortunately).

This question ought to go to the recruiter though.

The answer is 2nd Lt.

p.s. I did work with a doctor (a surgeon) who came into the USAF as an O-6 (full bird Col.)