Is the deliberate abortion of a two-month-old fetus considered as killing a soul, and what is the expiation required in this case, given financial inability and fear of the husband's reaction?

If your repentance is sincere, you will not be punished for the abortion you committed, for "the one who repents from sin is like one who has no sin," neither tormented in this world nor in the hereafter. As for what is required of you after repentance, it depends on the condition of the fetus. If you seek your husband's forgiveness generally without detail, for example by saying to him: "You have a right over me, so forgive me for it," then your responsibility is cleared according to some scholars. Paying the blood money (diyya) is not a condition for repentance; rather, it is a separate obligation.