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?