terrehautian
Master
This is where things start getting slippery. What is a human, what is personhood, blah blah. This will go in circles. I believe in the early stages it simply has potential for life. It's not yet human, it has no personhood. Once it has the ability to feel pain and has a working heart, then I can start to consider it human. Just my beliefs.
My opinion is that life begins and ends with a heart beat. At the hospital, if you flat line, if they can't revive you, you have no heart beat and you are dead. A baby's heart beat begins as early as six weeks (which is about two weeks after a woman should test positive to a test). I've experienced the joy and heart break that an ultrasound provides to baby heart beats. The first time my wife was pregnant, there was not heart beat at 11 weeks (actually probably stopped at 8 weeks). So far we are good at 33 this time.