After me asnwering that the physical life of Jesus began at His conception, you ask this:
So what was the spirit that was in Jesus body, before Jesus was conceived and born, a second “spirit”?
This may not be that easy for me to answer.
However man is composed of "spirit and soul and body" (1 Thess. 5:23)
I believe I would answer you that the -
The human body of Jesus the man came into being at conception.
The human soul of Jesus also came into being at this time.
The human spirit of Jesus also came into creation at this time.
In terms of His humanity all these human components came into being in the womb of the virgin woman Mary in the otherwise normal conception of the man Jesus.
But He was God become a man.
The full mystery of this I do not pretend to be able to explain completely.
The "Spirit of Christ" as Peter said was in the old testament prophets, was that divine part pre-existing and eternal to the past. That I think is not the human spirit but the Spirit Who is the uncreated God. And He was.
First Peter 1:10,11
Concerning this salvation the prophets, who prophesied concerning the grace . . . Searching into what time or what manner of time the Spirit of Christ in them was making clear, . . . testifying beforehand"
So what was the spirit that was in Jesus body, before Jesus was conceived and born, a second “spirit”?
The capital S - Spirit is God - uncreated.
The small s - spirit that Jesus along with any OTHER human being was created with, was an item of creation.
The Creator became a creature.
Or the Creator clothed Himself in His creation.
Sorry to distract form Roe vs Wade.
But I wanted to make myself clear.