Anyone else? Tmi

Cortney
So AF is due tomorrow 6/19 
​Monday 6/16 I just knew AF was coming that evening literally all of the sudden I got some cramps and backache had some red spotting and I took midol and went to bed knowing that another one bit the dust and it was gonna be a hell of a period. Yesterday nothing. No cramps. No spotting slightly tinged in the am but the vanished. No nothing today either. I'm a bit confused. It's like Mother Nature is playing games with me ? 
​Any insight or has this ever happened to anyone and they ended up being pregnant?