I recently took postinor 2 as a single dose. however i am having belly pain. how do i stop the pain and how will the pills affect my period?

Pelvic pain: Pelvic pain is complex as there are several organs in the pelvis. The ovaries, fallopian tubes, uterus, cervix, bladder, appendix, intestines, colon and rectum can all be the source. Pelvic pain requires and examination to help organize the evaluation. Emergency contraception may disrupt the menstrual cycle but should not cause pain