"&#039;i had sex on 1/16 the condom slipped off and we didnt notice till we where done. according to my period tracker i was fertile the day i had sex my ovulation day was the 20. i was totally freaking out. the next day i went to buy plan b($54) i took the pill at 5:40pm 18 hours after the accident. the next week i had swollen breast, cramps and i was eating a lot i was scared that i might be pregnant. i took a pregnancy test and it show negative. . i was stressing out for two weeks. till finally feb 1 i got my period right on time. i have never been so happy to get my period. plan b worked for me. i hope it works for you too. good luck"