From CHASS to BCOE at UCR

Current situation: I am a CNAS Biochemistry major, but I did not get enough to get 80% meaning I will not be able to be a major in CNAS.

ULTIMATE GOAL: PHARMACY SCHOOL

I now have to go to CHASS, and I plan to be a neuroscience major since it is interesting to me and it covers prereqs I need for pharmacy school.

However, I am also drawing an interest in bioengineering which is a major in BCOE. Now I have heard that going from CHASS to BCOE is pretty hard. Is it possible or am I basically screwed from my first quarter of college?