So killing a 2 day old zygote is murder? What about eggs and sperm? Should every one of them be used? At 2 days, there is nothing even close to a human there. Don't get me wrong, I don't agree with abortion in many circumstances, but it's not clear cut.

And "zygote" isn't a foetus, it is the first cell or cells that have not become specialised. A foetus is when it starts to became human shaped.