"Wow," I said, gazing at the ultrasound screen. "The head is so big." I watched as the long needle plunged into my uterus and withdrew amniotic fluid... After my routine blood work had come back with some mysterious results, my doctor's office called asking if I could please come in to discuss something, right away, like, today? My doctor recommended an amniocentesis. She assured me, "It's probably nothing."