First of all... good for you for barebacking some slut. Felt good didn't it?
Second... shame on you for not blowing your load deep inside her. Wasted opportunity.
Third... precum can knock her up just as easy as blowing a load in her so she may get pregnant. You may of ruined your life and created life all at the same time.
Fourth... If you catch anything (minor), see a doctor and get rid of it.
Repeat when possible.