I'm 11 DPO and AF due in 3 days. this morning when I wiped, there was bright red blood.. usually when I'm starting my period it's very very dark blood... I got upset and figured I was out this month and was going to have to try again for next month but now it's just very very light brown spotting. like 2 tiny drops on my panty liner and a small tint when I wipe... do I still have a chance of it being implantation bleeding? all PT are BFN so far.. including the one I took this morning but I've had severe heart burn, I've been nauseas and tired and feeling cramps for a week now. opinions?