me and my gf had sex a week after her period. we did not use a condom. i very rarely precum. usually only if im about to climax. i masturbated either three or four times several hours earlier that day and urinated before i saw her. we also did oral. when we had sex i did not let myself get too close to climax and if i started to i would immediately pull out. i finished outside of her vagina and it never got in contact with sperm from that. she is extremely stressed about it and i feel it could be a reason why her period would be delayed. we took a pregnancy test from the store on the day of her missed period and it read negative several minutes later. a day ago she felt that her period was about to start but then the feeling went away. what are the chances?