Oh those things will bleed for hours (not gushing blood, but having to change that gauze 50 million times!) I had one pulled a few years ago at around 5pm, I wanted to go to bed at 10pm and it was still bleeding! I had to put an old towel down on the pillow in case I would fall asleep and it would bleed. You mean it's bleeding enough that every time you spit you spit blood? Or do you mean your mouth is filling with blood? If filling with blood I would call the dentist, the other way? Totally normal!