What Causes Red Spot Along White Discharge From Vagina With Pcos?

HI,i suffer pcos, n i had a therapy of diane 35 for 9 months before a year or more, n now coz my periods getting irregular,first started with long ending duration of period, i again started using diane 35,
its my fist month n still there r 5 pills to take to get my cycle, i'm having whitish fluid in my vagina, also i have a red spot along this whitish fluid once or twice a day,before it come i feel a slight pain in my vagina, why is it happeining? should i stop taking dian 35?