Thank you for that very intelligent post. It is an interesting question b/c until the egg implants, it can never live. I guess you could talk about the difference between fertilization and conception.
In any event, Newt’s stance is firmly opposed to conception b/c obviously that concerns an egg that has implanted.
There is not such a thing as an 'implanted egg'. The 'egg' (I take it you mean to write ovum, not egg, we are not chickens) once fertilized is no longer an egg, it is a zygotic embryo.
Lastly, it might in fact be a good discussion to discuss the vagaries of 'conception' and 'fertilization'. There are stages in the processes that we conservatives really ought to get a better understanding of, so the progressives cannot baffle us with bullshit as they do now via their dead-soul media whores.