All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
It is incumbent on the perpetrators of Zina (unlawful sexual intercourse) to repent to Allah, The Almighty, of that immoral act by regretting it and resolving never to commit it again in the future. It is also obligatory to repent of undertaking abortion, which is forbidden without a Sharee‘ah-acceptable reason. As for your question about the Diyyah (blood-money) and expiation for aborting this fetus, if the abortion took place before 40 days of pregnancy, no Gharrah (blood money for aborting a fetus) or expiation is required for its abortion.
Allah knows best.