An hour ago I woke up from a 1.5 hour long nap and i found that i had completely bled through my pad, underwear, pants, and onto my sheet. This all had happened in the time of an hour and a half. The blood stain was about the size of a hand. When I went to the restroom and wiped myself, i found a large thick string of blood. My flow has settled since then. Was all of that normal? I'm only 16 and not sexually active. Please let me know, thank you.