A cluster of cells. Something "pre-human". Maybe even something like that ridiculous drawing that made them look like iguanas.
My own transformation came about with the sonograms, and also with many of my friends getting pregnant over the years. I realized that none of them referred to what was in their bodies as "my fetus", but rather "my baby".
My best friend miscarried on New Year's Eve. She went through incredible grief. She lost her unborn child, not a "choice".
To make matters worse, her ultra-liberal sister from Oregon was in visiting the whole family and staying with her at the time. There's always been a lot of jealousy since my friend is a success in her career, has an MBA from the U of C, etc., but what was said was totally out of line. Her sister informed my friend that she believed that the baby chose to miscarry because s/he didn't want to be born to someone who put so much time and effort into her career.
And they say republicans are mean-spirited. I am not a violent person, but luckily I heard that after she left else I would have gone and kicked her sister's a$$.
Then, on I went to nursing school, where I saw the products of miscarriages---and many times, the tiny infant was visible--even in an early miscarriage.
Nope, even laying religion aside, I don't believe I ever had any doubt that the product of human conception was a human. But then, I tend to see things in black and white--not a lot of gray in my life--LOL!