There is a flaw in your analogy.

The fertilized eggs as they are have no active potential for becoming a person until they are implanted.

I don’t think any pro-life individual would argue that an egg that hasn’t implanted in the uterus does not have that potential.

I don’t know how to fix you analogy to still make it workable but as it is it is comparing apples to oranges.

Or actually more like apples to a packet of apple seeds.