IS REPRODUCTION BLESSED, OR A SIN?

Genesis 1:28  And God blessed them, and God said unto them, Be fruitful, and multiply, and replenish the earth, and subdue it: and have dominion over the fish of the sea, and over the fowl of the air, and over every living thing that moveth upon the earth. (KJV) Leviticus 12:1-2  And the LORD spake unto Moses, saying, Speak unto the children of Israel, saying, If a woman have conceived seed, and born a man child: then she shall be unclean seven days; according to the days of the separation for her infirmity shall she be unclean. (KJV)

At the time of Genesis 1, there was no sin associated in any way with reproduction.  While reproduction is not, of itself, a sin (nor was it in the time of Leviticus), there is sin associated with it in the fact that we are all naturally born sinners.  Had mankind not fallen, the Leviticus laws would never have come into effect. Not a contradiction.