Yes, there were actually two concepts that came into play. One which Augustine subscribed to was the time when the body was sufficiently formed to resemble a human. The other was called animation, when the movement in the womb began.
I'm glad you mentioned sentience, because for those who think non-theologically, that must be a consideration. For me, it is one consideration as to when the Bill of Rights comes into play. It's unfortunate that on a conservative web site many fear being banned for simply doing nothing more than adding an intellectual point of view. There are certainly a few areas of no trespass to non believers, but I didn't know this was one of them.
Actually it was the critics of Easterbrook's essay who were banned, for other perceived transgression, apparently. Just an odd lucunae of FR history. For some reason I get a lot of slack, and I don't self censor myself. Never have, never will. I enjoy just being me.
No, informed conversation such as you have contributed certainly shouldn't be objected to, because it furthers the discussion.