Yes? No?

My af is two days late(due sat.)..starting wednesday i had some light pink blood, after a couple of hours is what a light brown, then it got a little darker of brown with a tad of pink blood, there was also brown spots on my panties. this last till about friday, i thought i was just about to start my period, i took a test this afternoon and it was a BFN😓...could i still be pregnant?