The fact is that you can also get different answers from different doctors as well as different internet sources so in reality none of us know for certain. If it is said that around 5 weeks the heart beats then that could be 30 days for one fetus and 40 days for another fetus. Just throwing that out there. We could argue the definition of begins over and over, I say it begins with daddys little squirt, others could say it begins with the gleam in mommys eye. Maybe it is when the sperm enters the egg, maybe its after the first heart beat. It may not be life untill the brain starts to function.
My younger brother was delivered at just past 6 months, in 1968. So who thinks a baby at 6 months or less couldnt survive today, many have a great chance. My brother is alive some 40+ years later so I think it's fair to say that life has a great chance at 6 months. He did need alot of medical attention and was in an incubator for quite some time, he had to have his breathing helped along. He made the Detroit News and the Detroit Free Press because then it was that big of a deal. Now it is not as uncommon as most people think.