Hello Thanks for writing to us with your health concern. No, your girlfriend could not be pregnant. This is on account of the following reasons - 1. There was no vaginal penetrative sex. Vaginal penetration is a must for sperms to be deposited in the vagina and lead to fertilization. 2. The sperm was on the hand, which is a hostile outside environment. Outside the cervical canal, sperm cannot survive for even minutes or seconds. 3. The hand was rinsed afterward, thereby further reducing the risk. 4. Touching the vagina to feel it is not the same as vaginal penetrative sex with ejaculation. 5. The biggest reason is that she has had her period after that. Following a proper period, there is no doubt of a pregnancy. Hence, do not worry. SHe is not pregnant. If you are still in doubt, take a pregnancy test 2 weeks after the encounter to be doubly sure, although I do not see any reason to do so. Take care.