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Having a scan in the first few months of pregnancy can be a thrilling experience.
It's helpful to know about twins early on, as it's easier to see whether or not they share a placenta.
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.
Finding out about having twins early in pregnancy also gives you more time to prepare for the birth and for your doctor or midwife to plan your care.
Knowing about twins early is also useful if you want to have screening for Down syndrome.