Pro-lifers, what is the difference between a fetus, an egg cell and a sperm in terms of life value?

A fetus, an egg cell, and a sperm are all potential human lives. Yet we flush egg cells and millions of sperm down the drain every single day without a thought. Isn't that a crime? Shouldn't we be making sure they all get born?
Pro-lifers, what is the difference between a fetus, an egg cell and a sperm in terms of life value?
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