Honestly thats a religious term, not a medical one, it refers to a belief in some faiths rather than how pregnancy actually happens. Biologically conception needs egg and sperm to meet. If you mean how a normal pregnancy starts, your gynac can explain it clearly.
That phrase comes from a religious story and means something special in that faith. In real life babies are conceived the natural way. Whatever your beliefs, take good care and stay positive on your journey.
