Hi there,
No subjects will hinder you as long as you meet university requirements. As far as i'm aware biology and chemistry are the two needed for majority of medicine courses but if there are any specific universities you had in mind it doesn't hurt to check their course requirements.
Just be prepared when taking 4 A-levels as it can be a lot of work, especially with essay subjects. You may find you would like to let one go after your first year which is absolutely fine and will not affect your ability to get into university. They only require three grades after all.
Good luck!
- Sophie (uni of Bath)