Hello, I currently study pharmaceutical science. I may be wrong but I don’t believe you can do a masters in pharmacy. I think the pharmacy course you would do as an undergraduate has an integrated masters. (4 year course, last year is the masters). I don’t know your situation, but if you really want to study pharmacy, could you not take a gap year? I would not recommend studying pharmaceutical science if you have your heart set on becoming a pharmacist.
Not sure what uni you’re going to either, but some offer a foundation year for pharmacy I believe. I also know somebody on my course switched to pharmacy after the first year (they begged to do this, I wouldn’t recommend though)