This is one decision that might be made for you.
Find your desired schools, look at their reqs, and get started. Placement can be competitive, and you may find that even if you get all of your classes out of the way in two years, you might not get into pharm college on your first try.
So keep that in mind. Have a secondary plan even as you go for pharmacy. It's great to have something like a chem or nutrition degree. So work for that at the same time. That's kind of what I am doing. But I sure hope to get into the department before then!