One of the only REAL grey issues in politics, due to the fact that the purpose of government is to protect life and liberty.
Thus you have the liberty of the mother to choose, but at some point it can be argued that the "child" must also be provided those equal rights.
The problem is, where do you define "child"? It can't very well be birth at 9 months because a fetus born at 8 months is still 100% viable as if it was 9 months.
I'm an atheist conservative libertarian. I don't believe the "every life is sacred" garbage either, a glop of goo a week in isn't "life", a month old fetus with no semblance of consciousness or neural networking isn't a life, and 9 months but with half a brain and missing limbs is certainly not a "life" (it's a biological CRC error and to force anyone to live like that to satisfy your own morality is selfish, better to end it quickly when it's just a organic "machine" and hasn't learned to be "human").
But there is definately some point where there are mature functioning organs, a functioning neural network and consciousness, etc, and it could be argued that government must fulfill it's roll in protecting life, liberty, and property by extending that to say, a 8 month old fetus.
I've never been terribly concerned about abortion, because if it was banned completely and someone wanted or needed one that wasn't government approved, they could fly out of the country and get it done somewhere else and fly home and the government would be powerless to stop, incriminate, or enforce anti-abortion law in just about any form. Even if it was illegal to carry a "US citizen" out of the country for abortion, the woman doesn't have to tell anyone when she finds out she's pregnant, and can take a vacation to a place it's legal. So essentially, a ban on abortion is unenforceable, thus I don't care what the law is on it either way.
Contrast with gun laws, where if something was banned, you could not get one period, at least not legally and not risking your life being reamed by the ATF. And even if you did manage to smuggle one in and keep it a secret, you can't share it or shoot it or talk about it or enjoy it, so what's the point? Thus I've always been more vocal about gun rights, and less worried about abortion. Something inside of you that only you know about and keep secret won't hurt anyone who doesn't know, however if something is not on the shelf anymore to buy you can't do anything about it.
All that said, as long as any restrictions, if any at all, (the current standard?) allows sufficient time to determine pregnancy, decide if keeping or not, or sufficient development to determine biological and medical soundness before such time that an abortion is banned, that would be acceptable.
Though really it's one of those things that each is best left to their own, or to the states, etc, though I'm well familiar with the argument that government must protect life as it pertains to a fetus/unborn child/whatever you want to call it.
It doesn't matter to me, because like I said, unlike gun bans, you can get an abortion out of the country and come back and not be held accountable in any way. But try smuggling in a machine gun no longer produced for sale in the US and see what happens.
PS I consider myself pro choice and I absolutely LOVE kids.