i am wondering about the likelihood of pregnancy. we had sex using condoms, but i was still a little worried so i took plan b within the 72 hour time period. however, i wouldn't know if i missed a period because i haven't had one for almost a year because i quit taking the birth control that regulated them, so my hormones were a little out of whack. i did have a period though one week after the sex. im am 19, weight 110 and 5'2. besides recent stomach problems i am otherwise healthy. thank you.