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Multiple pregnancy: antenatal care for twin and triplet pregnancies CG129. Ectopic pregnancy and miscarriage: diagnosis and initial management CG 154. Hormones in your blood vary according to your stage of pregnancy. Content of a Complete Routine Second Trimester Obstetrical Ultrasound Examination and Report. Prenatal Screening for Fetal Aneuploidy in Singleton Pregnancies. So a blood test at what you thought was 13 weeks wouldn't be helpful if you were actually 16 weeks pregnant. Journal of Obstetrics and Gynaecology Canada 36, 2: 171 – 181. Journal of Obstetrics and Gynaecology Canada 39 (8): e144 - e149. Journal of Obstetrics and Gynaecology Canada 39 (9): e380 - e394. In that case, you might need further tests, or a second scan to check the first scan's findings. The dating scan will also show if you're expecting twins, triplets, or more. It won't hurt, although you may feel a little pressure on your tummy and from your full bladder. If your uterus (your womb) is very deep in your pelvis, or if you're overweight, you may be offered a transvaginal ultrasound.
As long as the timings are right, you can have the NT ultrasound and blood test at the same appointment as your dating scan. The Fetal Medicine Foundation, Certificates of Competence. The UK NSC recommendation on Down's syndrome screening in pregnancy UK National Screening Committee. Journal of Obstetrics and Gynaecology Canada 38 (10): 982 – 988. Evaluation of gestation emedicine.[Accessed July 2017] Morin L, Cargill Y, Glanc P et al. Ultrasound Evaluation of First Trimester Complications of Pregnancy.