My girlfriend and I were both naked, and we were fooling around, I am fairly sure there was some precum on my penis, but not a lot. I had masturbated earlier that day, and I was feeling depleted. For about 30 seconds, she rubbed against my penis, not near the head at all, but she rubbed her vulva along the shaft. Later, I did give her some oral sex. That was it, no penetration, she is a virgin.
Please, I am freaking out. What are the numerical odds of her being pregnant?
You are not going to get pregnant easily that way, but if she happened to be at the fertile point of her cycle just then and a stray few sperm reached her lubricating secretions, she could get pregnant.
Why don't you make life easier and stop pulling such risky stunts? Something is bound to go too far, or touch, or your restraint will fail at a key moment, sooner or later. Condoms were invented so people who don't want to get pregnant don't. And that also includes people who have good intentions about not having penetrative sex.