my period is supposed to come TODAY, instead it started on the 17th (i think). I usually get it on the 22nd of every month and it normally lasts between 5-7 days. Here is my dilema, i started bleeding on the 17th and it only lasted 3 days. This has confused me SOO much! Am i pregnant and this is spotting or what?

 

ANY feedback would be awesome, thanks! <3