That is probably just puss, it will go away after a while and its probably caused because you pulled it out to early or the wrong way.Don't worry about it, The nerves will die eventually, But if it stays for weeks and weeks after then you should probably see a doctor.
Good Luck
I have to get four adult teeth pulled, two on bottom and two on top, and im so scared of the shot. I read up on it and people said don't try and do it yourself, but i already started and one tooth is loose-ish. Do u think i should just take them out or what??