"Hello, my partner had her period start on September 2nd. On the 14th, we had sexual contact. I did not ejaculate inside her or fully penetrate her. My sperm fell on my hand, and some of it landed on her pubic hair and outside of her vagina. We also had some minimal rubbing of our genitals. I am concerned about the risk of pregnancy. Based on these details, what is the risk, and is there anything we should do?"