I am wondering if this could be pregnancy related. I had spotting 4 days before my period that lasted half a day. Then I started my period when it was due that was only 2 1/2 days . My period was brown/black with red at times..very light for me. Normally my periods last 5 days and are heavy. My 2 previous pregnancies I had spotting, but it was only before my period was due.. my period is very regular and predictable, this time it's way off!