What Causes Lower Abdominal Pain After Intercourse?

hello i was wondering why sometimes when i have sex lately i get a sharp pain..feels like its in my ovary. than after sex i feel so sick to my stomach. i always get a yeast and a bacteral infection my doctor says i cant help that prob. but i had this pain once before it wasnt that bad and she said it was a infection in my ovary nothing mayjor whats wrong?