why do i have a white discharge?!

Well it's probably just hormonal changes, and you may be getting your period soon and if you just had sex, vaginal discharge is just what the body does to clean the vagina. Sometimes not being itchy doesnt mean you dont have an infection. Possible pregnancy, unlikely at such short notice lol.. i'm leaning toward the fact that the body does this to clean the vagina to prevent infection and bacteria.. Consult your physician, if anything.

first is do you have your period yet? if not then it is just a reg. thing that happens to every female. but if u do have your period.. i hope you have used protection anyway.. but dont worry its regular