What Causes White Vaginal Discharge?

Hello, i have been told by my gyno that i have vaginosis, she prescribed me anti-bacterial vaginal gel that im suppose to take one full dose a day for five days, i took it once and forgot about to take it the next day or two and recently after intercourse or wiping after using the bathroom, there will be these white, dough-like balls on toilet paper, what could it be?