Ive never been irregular?

Okay so I haven't started my period for this month, I'm 17 and I'm so scared right now because I'm 1 day late from my calendar for when I'm suppose to start. I did do this 1 week of hard core training and I've been breaking out (this happens before I start) but my breasts don't hurt, and I've probably had 2 light cramps, but this discharge has a bit of blood and it reminds me as if I were finishing for the month. Even though I haven't started yet..:'(