definitely look at schools you are interested in applying to before you determine your route. my degree is in biology, but i ended taking about a year's worth of extra courses to be eligible to apply to some schools. a lot of times, your degree won't include courses like microeconomics, speech, or anatomy & physiology, general psych or soc, etc. try and pick out what extraneous classes are common to the schools you're interested in, i found that helped me focus what classes to take. your last year of getting your degree, you will have applied already and you might have time to sign up for any classes that you'll need to take. i believe some schools allow you to take any leftover courses in the summer prior to starting pharmacy school as well.
Good luck! 😀