Have i started my period or not??!! Please help im really worried. =[?

When i came back from school i did the poo. And there was alot of blood on the backside. Then i checked the front incase it was my period and there was quite alot but not as much as on the behind. I thought i just might have cut myself. But it didn't hurt when i washed myself. So i went to the cl i go to after school and when i came back there was more blood. Now i'm quite sure it's my period and i'm really worried because i don't wanna have a period. Anyways i know all girls have to have one. Im 14 by the way. Anyways is it my period? I didn't feel a thing at all and no cramps.