My period ended on January 18th.  My bf and i had sex on January 20th, 2 days later.  I took the a 2 pill set of the morning after pill, one that night, and one in the morning.  my normal period isn't due until February 12th.  Now, I have been spotting for 3 days, with "flow" that ranges from nothing, to light red/pink color, to dark brown.  also, i'm extremely tired, and my back hurts way more than usual. is it  possible even tho i took the morning after pill, that i could be pregnant?  i've been pregnant once before and went to full term.  I'm just relaly confused and dontknow what to think about all this.  can someone please answer this for me?  thank you