"i had an accident on the most fertile day of my cycle and was so afraid since both of my children were conceived on the first try so i am incredibly fertile. i took the pill an hour after sex and had minimal side effects over the next week. mostly menstrual like cramps and tingly breasts. however because those can be pregnancy symptoms i was totally panicking. 9 days after taking the pill i had some strong cramps and noticed a little bright red blood after wiping. i thought it was implantation bleeding since my period wasn&#039;t due for another 5 days and i had it with both my other pregnancies. i figured the pill didn&#039;t work since i took it on the day of ovulation. but over the next hour it turned into a full period! plan b worked!!!!!!!"