I don't think it matters if you have your bachelor's degree. I went ahead and got mine, because it only meant taking a few more classes on top of the pharmacy prerequisites.
The pharm school I'm attending requires an AA degree plus 1 yr of gen chem, 1 yr of org chem, 1 yr of biology, 1 yr of anatomy, 1 yr of physics and a course in calculus. Oh, and public speaking, too. They recommended taking microbiology and biochemistry. At that point, I only needed 4 more biology courses to get my BS in biology, so I overloaded my schedule during the last year. Taking 21 credit hours sucked, but during my interviews I pointed out that I could handle the pharm school course load. That worked in my favor.