std? yeast infection ?

so i haven't had sex in the past eight months and i got tested after the last person and i was good! so i recently had sex with this guy and it was with no condom and about the 6th time we had sex two days after i started feeling itchy on my vagina and then a day later i start to get this discharge? that kinda thick. and it's white but doesn't have smell . what do u think ???? HELP