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A rather thorough discussion paper on Ultrasound screening in pregnancy can be found here.
You may have calculated the length of your pregnancy from the first day of your last menstrual period (LMP).
This is even though you don't actually conceive until 14 days after your LMP, or later than this if your cycle is longer than 28 days.
Ultrasound imaging in pregnancy is widely used to evaluate the baby.
It can determine if a baby is present, the position of the fetus and if there is a multiple pregnancy.
Transvaginal Scans With specially designed probes, ultrasound scanning can be done with the probe placed in the vagina of the patient.
Other placental abnormalities in conditions such as diabetes, fetal hydrops, Rh isoimmunization and severe intrauterine growth retardation can also be assessed.
Scans at this stage in pregnancy are reassuring for women experiencing bleeding, pain or who have had previous miscarriages.
Your midwife may recommend an early scan at between six weeks and 10 weeks if you have experienced bleeding.
You may also be offered an early scan if you've had a previous miscarriage.
Having a scan in the first few months of pregnancy can be a thrilling experience.
It's amazing to see the little blob with a heartbeat that will soon become your baby.