I woke up on race morning cool as a cucumber.  No race-day jitters for me.  I am not a detective, but I can easily attribute this to one clear fact: I wasn’t signed up to run a race. At 33 weeks pregnant, my already mediocre running talents were in near total hibernation. Registering for races was totally off my radar. But Matthew (my husband, remember him?) was signed up for the Bridgehampton Half and my pals Katy and Sarah were…