That's basically what I did. I was originally a biomed major, decided to change to nursing and did prereqs. Well, most of the biomed stuffs counted for prereqs. But unfortunately, when I'd applied for nursing school, I didn't get accepted the first few times, but I continued my biomed major with the intentions of graduating because I didn't want to waste time just applying to school. I figured I'd do the accelerated BSN as well.
It is unfortunate, though, that I got accepted to nursing school when I'd only need ONE more class for my biomed degree and graduate. Haha. But I'm happy I got into nursing school. It's my first semester in and I'm taking that last class (biochemistry, ugh) in order to just finish up the biomed major. I guess I'll graduate nursing school with a double major.
There's no problem with doing a major that's semi-related to nursing. If anything, you'll go in to the accelerated program with MORE information (i.e. biology, chemistry, organic chemistry if you need to take it) and you'll be more equipped. The microbiology class I had to take for biomed was MUCH MUCH harder than the prereq for nursing school. Right now I feel like everything is a review, especially when it comes to pharmacology, because a lot of it is chemistry, biology, some micro. It's nice
Anyway, good luck with your classes whether it's nursing or biomed. :chuckle