emergency contraception
"Before I begin, I would just like to put my body type out there; I'm tiny (5'4, weighing at 95lb). What had happened was it was day 15 of my 35 day cycle, and the condom totally just exploded into bits without either of us knowing, so my partner finished inside of me. Plan B was taken within 2 hours after the incident. The only side effect that I got was fatigue on the same day so I just slept it off. Exactly 5 days later, I started spotting which lasted for 4 days. At this point I was just trying to convince myself that it was because of the pill and not implantation bleeding. I would feel a little stab of pain in the general area down there every now and then, but it was nothing major. Around day 26, I've noticed that my cervical mucus has finally started changing, so I used it as a sign telling me to calm down, and that my system was finally up and running again. Finally on day 46 (after 4 pregnancy tests for reassurance) Mother Nature had finally graced me with my monthly.  

So ladies, just a word of advice, pay attention to your cervical mucus. For me, it let me know that the pill wore off and I started ovulating again. It won't be the same for everyone, but it is definitely something to look into. If you must, wait at least 2-3 weeks after the incident to test.
Best of luck~"