I’m twenty weeks pregnant, half way through a very much longed for pregnancy. I have two other children, one who came when I was twenty, the other when I was twenty-five. Both were easy and uneventful, my youth and high level of ignorance shielding me from most pregnancy anxieties. This time, however, things are different. It took us a long time to get pregnant, and an early miscarriage preceded this little one’s conception. Things have felt tender and tenuous.

At my first prenatal appointment, it was suggested that I get the blood work done for a sequential screening, a test that would