I completely agree with Beska. I would strongly advise that you try to transfer onto a biomedical science course if you know that you want to apply for GEM.
I studied pharmacy as my undergrad degree, graduated, spent a year doing my pre-reg then I worked as a pharmacist for a year.
It was only during that year that I really decided that pharmacy was not for me and that medicine was where my passion really was.
I am subsequently on a grad entry medicine course.
With hindsight however, pharmacy is a very long way round, especially if you KNOW that you want to study graduate entry medicine afterwards.
In all reality, it will probably be 5 years, because you would be stupid to get your degree and then decide against taking your pre-reg exam.
The only beneficial thing that it has given me is an understanding of drugs, doses, uses, classes, interactions etc, etc; which so many medical students really seem to struggle with (which is understandable because there are so many drugs out there that are used clinically)...
But those skills did not come to me during my pharmacy degree, but instead AFTER when I actually started to practice as a pharmacist (it's ALL about experience)... so I'm not sure you would even benefit that much from doing the degree.
A biomedical science degree seems much more relevent; you cover very similar topics that are coverd in the pre-clinical years i.e. physiology and pathophysiology etc..
Plus it's only 3 years.
It's also hard to guarantee that your motivation to study Medicine will still be there after 5 years of study. I know a few people who simply ran out of steam and settled for work after qualifying.
To cut a long story short..
It's very easy to take pharmacy lightly, but it's a tough degree and it's long.
Pharmacy is, and should be seen as a degree course for people who want to be pharmacists. As obvious as that sounds!
If I were you, I would choose another degree that will be shorter for you and will give a more all-round knowledge that will best prepare you for the pre-clinical years of a GEM course.
Of course, all of this is just my opinion; but I have been there and I think I might have chosen my options a little differently if I could have my time again.
Contact some Unis that do the biomedical science course and enquire about whether you could possibly transfer across.
I wish you all the best with it.