--Yes, actually, that's the Catholic position, which is why the Church opposes in vitro fertilization, because it's virtually impossible to do without killing some of the embryos in the process.--
It's practically impossible to try to procreate naturally without having a fertilized eggs die.
If that is true, then it's by natural causes.
Miscarriages and natural failures to implant are not deliberate killings. Christians believe that God has the power of life and death; we don't.
So what? Everybody dies some time or another; some younger, some older. What are you going to do; equate death by natural causes the same as murder?