When to have dating ultrasound
It's not painful, though some women find it a bit uncomfortable.
You don't need a full bladder for this type of scan.
If you've been having pain or you’ve been worrying about bleeding, you may be partly prepared for this.
Even so, it’s likely to be a distressing experience. If the findings of your first scan aren’t clear, all will probably be well at your second scan a week or two later.
Instead, we most commonly date pregnancies from the first day of the last menstrual period (LMP).
One reason for not dating pregnancies from the day of conception is that we cannot know that day exactly (excluding cases of assisted reproduction), but we can know the first day of LMP, based on what a patient reports to us.
Health-care providers define the stage or length of pregnancy differently than many people might think. Logically, one might imagine we represent a pregnancy by how much time has elapsed since conception.
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.
If you've been experiencing any pain or bleeding, the person doing the scan (sonographer) will also look for any cysts in your ovaries or fibroids in your womb.
It may be worth noting that light bleeding after sex can be common in pregnancy.
Although waiting can be hard, a later scan will give you more information.