What is the expiation for a woman aborting her pregnancy in the first month without her husband's knowledge, after their divorce, and is it obligatory to inform him of the matter so that he may overlook and forgive her?

Abortion is forbidden at any stage of the fetus, according to the more preponderant opinion. She who undergoes it without a legitimate Shar'i excuse is sinful and must perform sincere repentance. She has also wronged the father. Part of complete repentance is seeking the husband's forgiveness, even with general words without mentioning the abortion. If she fears harm, then she should increase her supplications for him.