What about Jeremiah 1:5? Leviticus 17 is talking about life of the flesh ONLY, not human life.
Using Jeremiah 1:5 you could make the argument that contraception is murder.
BTW the definition of murder is the killing of the flesh, not the killing of the spirit. Man cannot kill the spirit, only God has that power.
The question then becomes at what point does the flesh have "life".
I believe that there is a valid argument that the flesh is not "life" from a biblical standpoint until the heart begins to beat. I will concede that argument on a biblical basis. The fact is that 99.999999% of all abortions occur after the heart begins to beat, as most women are wholly unaware they are pregnant until about 30 days into their pregnancy.