Hi doctor, am Chrissie, i had unprotected sex with my boyfriend within on the day i was starting my mestrual periods, i took postinor2 after 16hrs, so i left it for a week and went for pregnancy testing, the doctor told me that there was no pregnancy, but i stayed not contented, now its time for my mestrual periods, but i have not gone through them, and am feelin lower abdominal pain and at times, backache. Am confused doctor. Help me out please i wanna know. Thanks.