Some weeks ago I took a plan B pill (feb.16). Exactly a week later (feb.23) I contacted them to report some spotting. The lady I spoke to said not to worry and to expect my normal cycle to come (March 8) except it hasn't come. I've taken some HPT and they've come back negative. I've called them again bcz they said after one week of no period you may be pregnant. Now another lady says that may have been my period. I'm really confused. . What could it be?