"BB- Certainly the statement "1. The human fetus is, from conception, a human being." must be considered seriously. If one accepts it, than anyone using "morning after" contraception must be considered a murderer"
But contraception by definition is intended to prevent conception from taking place in the first place. In other words, sperm and egg, never the twain shall meet.
The Morning After Pill is designed to prevent the egg from implanting in the womb wall. That egg is not always fertilised. If it is not, then there hasn't been conception in the first place. If conception has taken place, then yes, I suppose (agree) that you are right and the morning after pill is a form of murder. If you intentionally do something that you know could kill someone I suppose it hovers between some kind of intentional murder and manslaughter in a rational moral sense.