I was always ambivalent about this issue until my wife got pregnant. She was pregnant with triplets and we were encouraged by the doctors to "selectively reduce" the number by killing one. I couldn't imagine doing so and neither could my wife.
Every time I look at our triplets now (they just turned four last month) I shudder when I think of which one wouldn't be here if we had gone along with "selective reduction."
My opinion nowadays is that, except in cases of rape or incest (where obviously the woman did not have a choice), there should not be abortions. If a woman doesn't want to have a baby she should not have sex. If she chooses to have sex she has no right whatsoever to murder the baby if she doesn't want to have it.
Just my two cents.
Cogito ergo summopere periculosus.
Fiat justitia, ruat coelum.