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The Fetal Medicine Foundation, Certificates of Competence.
The UK NSC recommendation on Down's syndrome screening in pregnancy UK National Screening Committee.
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. 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. But that won't tell you when you actually conceived. Conception usually occurs around 14 days after your LMP, which is when you ovulate.
The ultrasound scan may determine whether your pregnancy is currently experiencing miscarriage or not.