I often wonder why abortion advocates post questions like these. Is it to assuage your guilt in some way? What sort of information could you hope to possibly gain here? Isn't it about confirming what you have chosen to tell yourself, that the life of the unborn doesn't matter?
Technically speaking, a zygote or blastocyst is a unique living human organism, it becomes this at conception, and nothing in science or biology disputes this. There are people in our society, who feel human life is sacred, and should never be destroyed by man under any circumstance. I would suspect these people most likely do not endorse IUD usage, and some may not believe in birth control of any kind. What they support for their society, is their right and opinion, and they are fully entitled to have it. You don't get to decide what they support and condone because you are not who these individuals answer to.
Abortion is a complex issue in our time, and one that is not easily solved, mainly because of a complete lack of understanding on both sides. Pro-lifer's believe in sanctity of life, and they won't budge... Pro-choicer's believe in a woman's right to choose, and won't budge.
My personal and political views on abortion differ, and it is because I understand we live in a homogeneous society and should have laws that govern accordingly. Personally, I am pro-life, it is never any question. Politically, I would like for us to come to terms with some facts, and honestly establish some criteria for what we are doing as a society.
The fact that most needs to be accepted is, life begins at conception. At that moment, it becomes a unique human life, and calling it something else, or pretending it is something other than a human life, is foolish and irrelevant. It's not something else, it won't be something else, it is a human life. Accept it! Understand it!
From that point, we can begin to have a reasonable and civil debate as a reasonable and civilized society, when people should be allowed to terminate a human life. I would think we might be able to draw a reasonable solution between 'never' and 'partially birthed' and at least make abortion something more serious than getting a pedicure. I don't begrudge women a choice, I think women deserve a choice, in birth control, in whether to have unprotected sex, and if they are raped or their life is at risk... but to just say they arbitrarily have the right to end human life at any stage of pregnancy, is bit extreme for me. I don't think any human has that right or should be allowed that choice.