My girlfriend's last period started on 9 may and we had unprotected sex on 12 may, but I didn't ejaculate inside her then she took unwanted 72 on 14 may and till now she didn't get her periods. Her periods are already late by 7 days. She took pregnancy test 2 time and it came out to be negative. But today on 18 june suddenly her lower abdomen started paining a lot but till now no periods. What could be the reason of the pain and no periods till now? Are there chances of pregnancy? She doesn't have any early symptoms of pregnancy.