bleeding pre-period?

Natalie
Hey, can anyone help? 
This morning I was getting hot under the covers (sorry for the tmi haha) and when I went to the toilet afterwards, there was blood on the toilet paper. 
I'm 12 days away from my next period (says eve) and it wasn't like its my period, because it was only a little bit. Still kinda freaking out. What's going on?