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Your 12-week(ish) ultrasound This scan (performed on the belly and sometimes vaginally—called a transvaginal ultrasound) in combination with a blood test will complete what’s called a “nuchal translucency test,” which estimates the likelihood that your baby will have Down sydrome by measuring the fluid beneath the skin of the back of your baby’s neck.
What about the 20-week ultrasound and all those other tests that moms-to-be have to take — amnio, glucose challenge, routine bloodwork? You might also be sent for one to check your conception date and to make sure the pregnancy is progressing well.
I was scared, scared of it not working, and scared of the pain - those needles they had to jab through my stomach and push through my womb were incredibly long. (Read about those tests below.) The ultrasound technician will also measure the length of the fetus to give caregivers a more accurate estimation of your due date. If the test indicates a high likelihood, caregivers will recommend amniocentesis or CVS (Chorionic Villus Sampling), which are more invasive tests, but will give you accurate diagnoses.Since 1836, doctors have marked the first day of a woman's last menstrual period as the first day of pregnancy, or “gestational age,” not when a sperm fertilizes an egg.Ovulation happens about two weeks after a period, on average, and fertilization happens within 24 hours of that.