emergency contraception
"I didn'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'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."