"i didn&#039;t even have intercourse, but there was a chance some sperm may have gotten onto my vulva area. 17 hours after this possibility, i took plan b one step.  approximately 8 days later, i had some bright red bleeding for a few days. i was scared it was implantation bleeding, but also knew that a lot of women have withdrawal bleeding around this time. i took 4 pregnancy tests, all negative. my last period was july 7th and today, august 9th, my period finally started. i don&#039;t know how many hours of research i did or how many different health advisers or pharmacists i chatted with online, but they all reassured me it was highly unlikely i was pregnant. i have one test left, so i plan on using tomorrow morning, just to be certain."