Hi! Today I was using the restroom and noticed a big red stain in my underwear with discharge around it. At first I thought that I had started my period for sure, but it was not just plain blood, so I am not sure. I am 13, and have never had a period. I haven't told my mom yet, because I am not sure it is a period. It has continued to come out all day, but there is still some discharge with just a bit of blood. After earlier, I put on a pad, and it has been absorbing most of it. Am I starting my period or not?