Suggest Cause And Remedy For White Discharge

umm im 16 and i just had my periods on the regular date but it lasted only for 3 days....4 years i had got my periods on 31st december n from then on every dec i get it on 15th dec n 31st dec for 2-3 days..this time i m seeing sum white discharge being continuosly discharged from my pussy is it jus bcoz im gonna chum tmrw or is it sumthin i need to worry bout?