If you have genital herpes and you go to take a pee and a little drop of urine lands on your upper lip, will you get infected ?

Probably not: Transfer of an HSV infection from the area first involved to another area is called auto-inoculation. It sometimes occurs during the first infection, i.e. within several weeks of catching the virus. After that, the immune system prevents auto-inoculation. If someone has had genital or oral herpes more than a few months, it is very unlikely s/he will ever self infect other places on the body.