What Causes Irregular And Bad Odor Vaginal Discharge?

Hello Doctor - I had a d&c in November last year, since then my periods have been irregular . This month my date was 13th , today is 17th and still I have not gotten my periods ..instead i have had 3-4 episodes of gush of warm smelly discharge ..also had pain while having sex ..had a burning sensation with urine a week ago which has subsided now ...