Go down to your local Family Planning clinic and have a chat to a nurse. They are usually more than happy to help and will advise you on what's best to do. I have not heard that there are any side effects with taking the pill at a young age, but as already said, it is not advisable to be having sex at such a young age. But after all said and done, it is a personal decision and if this is the case then you are being quite sensible in considering the contraceptive pill. But be aware that the pill will NOT keep you from getting sexually transmitted diseases. So extra precaution is strongly advisable if you are sexually active.