Trust me, if I murdered someone, I would be freaking out a lot more, and not have actually asked this question on the internet. I think I got a gash in my leg last night. Found my jeans a bit ripped with some blood. I don’t remember it happening, but it looks like it did.
Or this could be a technique to make it seem like you’re innocent. Because what murderer would post something like this on their blog? Where’d you get the gash from? You should probably visit the hospital if you haven’t already. And throw away the sheets if you can’t get the blood out.