I took a plan b pill on January 12th.  I was supposed to get my period on Monday February 1st. Instead I got light spotting that was pinkish brownish, although there was some red blood on occasion over the course of 3 days. Did the plan b just make me a have a light period ? Instead of my regular ? Or could I be pregnant ? I'm still having this light spotting and it's been 3 days. Ps I took a pregnancy test and it was negative