I'm ok everybody, when i went outside whoever was lurking had already gone. I checked the ground around the spot i heard the sounds from and found some boot prints in the mud. After closer examination i found bits of sand around the boot prints. Good news, Slender is not stalking me. Bad news, someone else is.
P.S. You may be wondering why it took me 6 hours to update that i found nothing outside. What happened is that my computer stoped working after i went outside to check, just got it working now.