I have been training for a marathon for several months. I just recently found out that I am pregnant, and am thrilled! What I am concerned about is the fact that in my fourth week, before I knew I was pregnant, I ran a 9-mile session. I drank 32 ounces of water while running, but did get hot and sweated a lot. I have heard that raising the body's core temperature too much can cause brain damage to the fetus. What is the possibility that I unknowingly caused such a thing to occur? I, of course, will not be continuing such intense training, but am worried sick about this nine mile run. I welcome any info you may have.