When to have dating ultrasound


A miscarriage is more likely to happen if an embryo is growing slowly, or has a slow heartbeat and a small yolk sac.The scan may show an empty sac (blighted ovum), or a sac with a small embryo, but no heartbeat (missed miscarriage).However, the timing of the actual delivery is not so predictable.Some women will deliver on their due date, others before, and others after.It's not painful, though some women find it a bit uncomfortable.You don't need a full bladder for this type of scan.However, the scan may show that one sac is growing and the other is still empty (vanishing twin syndrome).

In the early weeks, a scan is usually carried out via your vagina, as your womb will still be deep in your pelvis.If so, you'll have these scans in early pregnancy at clinics in larger hospitals.Even if you've had a miscarriage before, as long as your current pregnancy is going well, you may not be offered a scan. So if you need the reassurance, your GP should be able to request an early scan for you.The only reason for having a scan before you’re six weeks pregnant is to rule out an ectopic pregnancy.If you have a severe, one-sided pain in your belly, it’s essential to find out what’s causing it.Instead, we most commonly date pregnancies from the first day of the last menstrual period (LMP).

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