You are confusing reproduction with evolution. Individual living things come into existence by a process of reproduction. Evolution is the process of cumulative change over many generations that leads to the origin of new species.
The birth of Jesus was an act of reproduction, not of evolution. To put it in its crudest terms, Jesus came out of a woman's vagina, like you, me, the Pope, King Charles III, the Archbishop of Canterbury and anybody else you care to mention. No doubt, Jesus's birth was as painful and messy as the birth of any other child. Also Jesus inherited his genes, including his X-chromosome, from his mother, just as you and I inherited half our genes from our mothers.
So far as I can understand it, the doctrine of the Immaculate Conception is an imaginary solution to an imaginary problem. The Christian Church teaches that original sin is a condition of sinfulness that we have all inherited from Adam and Eve. If this were true, Jesus would have inherited original sin from his mother. To escape this problem, the Catholic Church teaches that the Virgin Mary was free of original sin from the moment of her conception. You can look all this up on Wikipedia. Since I don't believe either in Adam and Eve or in original sin, I regard both the problem and its solution as imaginary rather than magical.