There is such a thing as pregnancy depression, but it's not properly called "pre-partum" depression, and it would never be called "pre-partum" in a woman who had an abortion.
The reason might become clear when you look up the word "partum". [...]
[There is] some other reason the women were waiting until the last trimester to obtain an abortion.
Although development is still a gradual process, "and life does not begin at conception", I guess it still makes abortion appear more like infanticide because of the images formed in the mind. [and just to rub it in, someone outside just started operating a power drill