Hi. I had unprotected sex last August 8, the 10th day after the first day of my last period. I took Nordette 4am and 4pm the next day, August 9. Today, I had bleeding around noon, but it stopped after 4 hours. However, I am still having cramps. What does this means? My next menstrual period will be on August 27. I am freaking out after reading about implantation bleeding and implantation cramps.