cd 36 late af bfn

had sex on day before predicted ovulation. it was protected. i have an average 33 day cycle and i was supposed to get period on cd 34 but here i am late for af. have only had sore boobs on and off since predicted ovulation and had some cramps during that period and on one day last week. else i have no signs of af coming. i tested negative though on cd 33. now i have this weird discharge. please help me.