I’m stretching my mind trying to make this connection, youve lost me you are going t have to walk me through this leap slowly. When the Gemara says we execute a pregnant woman who is chayiv misah. Does that mean we also kill her children if she is chayiv misah?
No.
The Gemmara is not pro abortion, so it wouldn’t follow.
That was a contention that only works if you are pro abortion.