Is it possible for a girl to become pregnant from semen that was ejaculated inside her after discovering a torn condom, taking into account that she uses birth control pills and washed her private parts after intercourse? And is it possible for a virus to be transmitted as a result? And what should the ejaculator do to be sure and reassured?

You have done well in turning to repentance, which is a blessing you should feel and thank Allah for by being upright, seeking beneficial knowledge, performing good deeds, and keeping good company. Strive to repel intrusive thoughts by seeking refuge [in Allah] and remembering Allah. Let your concern be to erase the traces of sin by sincerely repenting, asking for acceptance, and remaining steadfast. Increase your supplications to Allah for well-being, and do not seek out or contact the woman you harmed, so as not to reopen the door to evil. Strive to get married and ask Allah for facilitation, and do not let your dislike for the opposite sex prevent you from marriage.