This is such a difficult question.
One of my friends (still a virgin at the time) got gang raped by at least 5 men. She was 18 and poor.
She fell pregnant because of that. As abortion was illegal in this country and she was a staunch Catholic, at that time, she went to Europe early in her pregnacy for a safe abortion. It cost her family basically a year's income. After that, she started studying at a Uni and today she is quite wealthy.
She regrets the abortion, but realises that it was to her best interest. Was she wrong or right to have the abortion?
On the other side, one of my uncles (80 years old) decided that he's had enough suffering. He gathered enough strengh to pull his own plug. It was right next to his bed.
So, in the end, it's up to the individual to decide where life begins or ends.