Late Period lasting longer then usual...?

I was expecting my period on the 1st of June which never came.. i took an HPT which turn out negative...on the 18 i starting spotting dry looking brown blood then it turn dark red where i seen 1 blood cot then from there on to a red bright ... my bleeding isn't heavy..it moderate what can possible cause this? I been bleeding for 5 day now? this isn't normal for me..