situations where abortion can be considered

A(1) Please look up the following article (Eng. & Heb versions):
Human Cloning: Scientific, Ethical, and Jewish Perspectives, Steinberg Avraham; Loike John; in: JME Book Vol. I, pp.191-209
שיבוט בני אדם: היבטים מדעיים, מוסריים ויהודיים     פרופ' אברהם שטיינברג, אסיא סא-סב, עמ' 27-42
A(2) It is not so simple, and even might be impossible to give general rulings for these situations, as some specific details may change the rulings.
Therefore, the right course of action is to ask a Rov in each specific case.
A(3) In general, we know the rule of 'Lev yodeaa marat nafsho' so if the woman is sure that continuation of the pregnancy may endanger her life abortion should be permitted. But we should be very careful to avoid an abuse of such a statement by others.
Therefore, we cannot avoid a private discussion with a psychiatrist and with a Rov.