(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.
(Note: Your caregiver might require you take additional tests. Talk to your caregiver if you have questions or concerns.) Tests in first trimester What to expect Your first ultrasound(s), blood and urine tests When Weeks 11 to 13 (*dating ultrasound is done sooner) Dating ultrasound Not everyone gets this scan but some caregivers offer a dating ultrasound if you’ve had bleeding in the first few weeks or had problems in prior pregnancies (miscarriages, etc.).
First prenatal blood tests After your scan you’ll have blood taken.