You'll have to catch up on all the stuff you missed out on, however, if you really enjoy Business Studies, it is better for you to put in 2 weeks of hard-work, as opposed to:
1. Waiting for a while, then having to catch up on MORE work (a stitch in time saves nine)
2. Waiting, and eventually, when you do approach your DP/YA, he/she says "Sorry, you can't change subjects anymore".
My school generally allows students to change subjects up to about Week 6/7. Most schools will want their students to change their subjects to subjects they like, because chances are, if a student enjoys what he/she does, they will do better in the exams, which is what the school wants.
But as Without Wings said, you need to talk to your DP/YA/whoever.