You'd need an AMENDMENT to extend legal protections to the unborn.
You're laying out what is essentially a pro-choice position. Which is no surprise. That's where the Paul ideology ultimately leaves you if you try to defend it.
But no, you'd rather fight against a viable approach and continue to allow abortions on demand.
The Paul position is the Gerald R. Ford position, in detail. Over 37 years, that is the position that has proven not to be viable. No surprise, since it is not moral or constitutional, and it gives every politician political cover for inaction.
By purposing a "life begins at conception" Amendment? Only in your bizzaro world. :-\