Hi, i was supposed to start my period on the 2nd of aug. but it never came that day. then on the 6th, i started bleeding a bit of pink with mild cramping, then it turned red an hour later. the flow was not heavy as my normal period. the flow lasted only that day. the next day though today, there has only been brown spotting. could i be pregnant? i took a HPT about 3 days ago but it was negative.