Don't take it so seriously! I did, after all, allow for the likelihood that you were only speaking "through me" to other, less-knowledgeable FReepers!
(And yes, I'll admit it: I am a little tightly wound this morning!)
We have all heard it — life begins at conception, but obviously not at fertilization since the fertilized egg can be frozen.
The Merriam-Webster definition I provided makes it clear that "fertilization" and "conception" can be used interchangeably - at least in all but the most-technical contexts (i.e., IVF technicians might have good reason to differentiate the two).
I, for my part, regard CONCEPTION - the fusion of sperm and ovum to form a zygote - as the starting-point of human life, of the existence of a new HUMAN BEING, regardless as to whether it can then be frozen or not.
The mere fact that an embryo has been frozen has no bearing upon its dignity as a human life. Whether it is still floating down (up?) the Fallopian Tube or has already implanted in the endometrium of the uterus has no bearing on its status as a human being (in an albeit very early stage of development).
Do you agree? (Your "we have all heard it" makes me wonder whether you are mocking that or saying it sincerely.)
Regards,
My point is, not every fertilized egg, fertilized by normal, natural methods, is implanted on the uterus wall and develops. Scientists say about half do not.