FIT1008: Introduction to computer science
FIT1004: Data management
MTH1030: Techniques for modelling
BIO1022: Biology II
If you're transferring to Science, you can still undertake a minor in Computational Science which comprises the following:
FIT1002
FIT1029
FIT1008
FIT2004/2014/3139
This will give you a real taste of programming without committing. There's not much difference between a comp. sci degree and a compSci major within science. I think you'll find programming gets a bit more fun when you get to OO basics, recursion, data structures etc.
You might be in a bit of a bind because all of the units you're doing are prereqs and you won't be able to overload this semester... maybe you could replace one of your CS units with chemistry and overload next semester. FIT1002, 1029, 1008 and 2004 are offered in either semester one or two.
You best speak to an advisor at the science office.