My last menstruation was last sept.22-26..my BF and i had sex on oct.3.. my usual menstrual days are between the 33-36 days and based on the ovulation calendar that i have, i am suppose to ovulate on oct.11 and my next menstruation will be on oct.25.. so i am worried that i might get pregnant during the time when my bf and i had sex..we used condom and he was so sure that he did not ejaculated.. what are the possibilities of pregnancy to occur from this situation?? thanks..