What should I do if the girl became pregnant and gave birth after I repented to Allah for having committed adultery with her? And should I admit that I committed adultery with her and marry her, while I am still taking money from my father?

Adultery is one of the gravest sins, and those who commit it must repent to Allah. Repentance is accepted from one of them without the other, and no one is held accountable for the persistence of their companion. The adulterer should conceal their sin and not confess to it. It is permissible for the adulterer to marry the person with whom they committed adultery, after her repentance and the clearing of her womb. As for the child born of adultery, they are not attributed to their biological father (the adulterer) and do not inherit from him; rather, they are attributed to their mother or a name dedicated to Allah. There is no specific time for a woman to know if she is pregnant. Aborting a pregnancy resulting from adultery is forbidden and adds a crime to a crime; it is not justified by fear of scandal. There is no expiation for adultery other than sincere repentance.