I'm certainly not blanket "pro-choice", however "life begins at conception" is untenable as well. It's almost impossible to enforce very early term abortions and many forms of contraception would be illegal if a so called "Life Amendment" were passed.
I think a fetus is a person, or at least close enough to be protected at a certain point after conception. I'm not entirely sure when that is, but somewhere between a heartbeat and quickening might be good places to draw the line. I do not think a fertilized egg or a ball of undifferentiated cells is a person.
Research shows that making abortion illegal doesn't reduce abortion rates at all, it simply makes it less safe for the woman.
Countries where abortion is illegal have similar rates to those where it is legal.
I do think abortion should, at the very least, be illegal after fetal viability with exceptions for the life of the mother and *severe* fetal defects. I could see more restrictions being placed, but a blanket life amendment type law wouldn't be supported by much of the population at all.
I am also interested in addressing unplanned pregnancy with greater access to birth control as well as better social support for women who choose to have their children. It's these latter two that many right wingers object to, which makes me think instead of being pro-life, they are simply "pro-birth". once the kid is born it's up to the parents to take care of the child. "Government provided social services just reward bad behavior!" they say. Unfortunately the lack of them punishes the very children they insist must be born.