What Causes White Discharge And Itching Around Vagina?

Hi, I have a white discharge and slight itching in and around my vagina, my boyfriend has recently noticed some tiny red bumps on the head of his penis but they remain itchless ans painless. We were both treated for trich a month or so ago with flagyll and I was recently taking amoxocillin for a tooth infection. Could I have developed a yeast infection after my course of amoxocillin and passed it on?