Every time a woman menstruates, the bloody flow includes the corpse of one (or more!) preconceived babies. This is why menstruation has been known as "The Curse".
There are an estimated 3 billion women of childbearing age, menstruating an average of 12 times a year. That is 36 billion preconceived babies dying every single year!
In addition, if a woman reaches menopause or has her reproductive organs removed before all her preconceived babies have had a chance at life, all of her remaining preconceived children will die--and her own body will be their grave.