hello me and my girl friend had sex on 16,17,18 i din't use any condoms while doing but am sure i din't cum inside her but due to pre-cum i am little worried due to that i gave her morning after pill on 17 around 24hr from 16. but on 18 accidently we did it .now m sure that i din't cum inside her on 18.is there any chance of her pregnancy .as she had her last mens cycle on 9th which ends on 15th and we did it on 16 17 18 ..due to this m little worried as she have cycle of 28 days ...please help me