Are you carrying twins?
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You might suspect that you are carrying more than one baby if:
• you are very sick in early pregnancy
• you seem bigger than you should
be for your ‘dates’
• twins run in your family, or • you have had fertility treatment.
It is usually possible to find out
through your dating ultrasound scan, which happens between eight and 14 weeks
You should be told at this point whether the babies share a placenta (are identical) or if they have two separate placentas, in which case they can be either identical or non-identical. If this cannot be determined, you should be offered a further scan. A third of identical twins have two separate placentas.
This happens when the fertilised egg splits in the first 3–4 days after conception and before it implants in the uterus.
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