I took the Plan B One Step pill October 11th and then again the 24th after two sexual encounters. Each time I took the pill within 24 hours. It's twelve days later and Im startinf to spot! it's light and happens around 2-3 pm every day and tapers off around 5 or 6pm for the last three days. I'm expecting my period next week according to my ovulation/period tracker. Is this a side effect of taking so much or should I worry for another reason?