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During your first trimester, you may have an early scan at about six weeks or seven weeks. However, you'll only be offered an early scan if you're experiencing problems, such as pain or vaginal bleeding. These appear white in the image, and soft tissues appear grey.Fluids, such as the amniotic fluid surrounding your baby, appear black.
Hard tissues, such as bone, reflect the most sound waves and so make the biggest echoes.
A first-trimester scan will check that your baby's heart is beating and also look at the basic anatomy of your baby’s head, abdominal wall, and limbs.
Ultrasound scans have been used in pregnancy for decades, and nobody has found them to be harmful if carried out correctly.
But if your baby's lying in an awkward position, it's not always easy to tell.
Plus, some hospitals have a policy of not revealing the gender of a baby.
However, you will need to ask at the start of your scan, and your hospital may charge for this service.