Well what are your interests? If you are really set on Medicine then your grades seem fine for some unis. (Someone at my Sixth Form applied for Medicine at top unis, he got into Oxford but got rejected from Birmingham. My mum and I reckoned it was because he's very academic - he was doing 5 A-Levels to start with!) However if you've changed your mind just think about what you'd like to do for a career, etc.
Questions to ask yourself:
Do you want a research-based career?
Do you want a secure career?
Do you want a good income or would you be happy not making a lot?
How much repetitiveness do you want?
How much in terms of holiday/days off do you want?
Do you want to be outside a lot?
Where would you like to live - remote or urban?
Which subject do you look forward to the most - Maths, Chemistry or Biology?
And which area of the subject do you enjoy the most?
For example, I absolutely loved doing Biology at Sixth Form and school, and the bit I enjoyed the most was ecology and the environmental aspects. I am very concerned about conservation and the environment. So I ended up doing Ecology and Wildlife Conservation.
Think about what you'd like to do for a career as well as your passion.