i recently got my period nov. 9th 2012 and ended it on the 13th, and then on the 17th after i had intercourse i noticed a pinkish brown spotting.. then it stopped and then the 18th i got (what it seems) my period again.. and this time in abnormally heavy.. i.m not sure whats going on? because it seems like pure blood, not "menstral cycle" blood...
try a pregnancy test