On May 17th, I was involved with some sexual activity with a guy. We didn't have intercourse, but we did touch each other a bit, and bodily fluids may have been swapped. The next morning I got the Next Choice pill just to be on the safe side since I had been drinking and wasn't sure whether or not any semen had gotten on me/inside of me. I am also not on regular birth control. Eight days later, I had what I am assuming was a normal period with normal bleeding, which lasted 4-5ish days. I have not gotten my next period. I took a pregnancy test last weekend (which was negative), and another one today (which was also negative), but I'm still concerned. I know that you can miss a period because of stress (which I am, as I started a new job at the end of May, as well as a new diet/exercise plan), but could I be pregnant? Additionally, the sexual encounter on May 17th was the only one I've had since January. Thanks!