The surrounding environment including the vagina is not suited for the semen. So, the semen has to be inserted into the vagina and close to the cervix in order to conceive. The contractions of the woman also help the semen to enter the uterus and further travel to the Fallopian tubes where the actual conception occurs.
According to the data you reported, there is no chance for pregnancy. You will know for sure that she is not pregnant when she gets her period.