It is not circumstances, but a woman's live. It is easy to reduce this to something "principled" when you are a man and will never be in a similar situation.
I am sympathetic to your position in general, but this is not an argument. Like it or not, there are lots of women who take the same stance. The idea that someone's gender is even remotely relevant in the abortion debate is based on some very problematic assumptions. You don't have to be able to have a child in order to have an opinion (more specifically, a negative opinion) on abortion.
Of course not (and obviously never claimed so), but it is no coincidence that male pro-lifers tend to
disproportionally take the black and white principled position where the health and functioning of the mother is ignored. There is a lack of empathy connected to this and that is rather obviously enhanced by never having to deal with a similar situation. Gender creates a distance in this area.
Anyway, we are talking odds here, not absolutes (as always when dealing with the generation of human opinions).