What Causes Abdominal Discomfort And Bleeding After Intercourse?

hi i am 37 years old trying to get pregnant for the first time took clomid 100mg OD on D5 to D9 of my cycle , i had sexual intercourse on D14 and D17 although i am still not ovulating, i also feel abdominal discomfort a day after my sexual intercourse and started to bleed, before i took clomid i have a regular 28 day cycle its my first time to have bleeding in between my regular menstruation and i am wondering when will be my ovulation day.Is this normal pls help thanks.