If you have already completed post bite vaccination a couple of weeks back, then there is nothing to worry about.  Since the bite is in lip, you can get an opinion with your physician for immunoglobulin injection alone.

Since you completed your full rabies vaccination course, your body has already developed strong immunity against the virus. Getting bitten again just 15 days after completing the vaccine does not require another full vaccination.

If you completed a full post-exposure anti-rabies vaccination schedule within the last 15 days and are bitten again, you may not repeat the entire schedule but instead get a booster dose of 0 and 3 days respectively. previous vaccination provides you with memory immunity, and the booster doses will effectively boost your immune response