When I became pregnant with my 4th child, I was 39 years old.  The doctor wanted to do the amniocentesis.  When I asked why, he said to determine if my child was Down's Syndrome.  If the baby tested positive for that, we could terminate the pregnancy early.  He told me to go home and think about it.
 
I looked at the various statistics about the probability of this occurring in this pregnancy thinking it would be good to know and be prepared for a special needs child.  Then I read the statistics on the number of miscarriages that occurred as a result of the amniocentesis.  The odds were greater that I would miscarry than that I would have a Down's Syndrome.  I declined the test with no regrets.
 
I gave birth to a very intelligent and handsome young man (now 22 years old) and 18 months after his birth, had a very intelligent and beautiful daughter (now 20 years old).  God is so good.