spotting for a day then no period?

ok so.

my period is due to start today or tomorrow. I usually spot 2-4 days constantly before my full blown period comes on.

I started spotting very very late saturday night, pink blood

spotted almost of the day yesterday (brown blood)

and this morning nothing. haven't had any blood at all today.

I usually cramp or spot non stop until af rages in lol. I've had a little cramps here and there but nothing to make me "think" af will here anytime today or tomorrow.

so I'm either late or af will sneak up on me tomorrow.

negative tests Friday and saturday.

has this ever happened to anybody else?