I Had unprotected sex but then used ipill. She had menses on 3 /9/ 18 but during which we had sex n used a ipill due to which she had prolonged menses till 12 after that we went to the doctor and took proper medications. Now on 26th we had unprotected sex and used ipill right after it. What are the chances of pregnancy in this matter and what are ways to avoid the pregnancy?