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However, conception doesn't actually occur until around 14 days after your LMP, or later if your cycle is longer than 28 days. Multiple pregnancy: antenatal care for twin and triplet pregnancies CG129. You may know when your LMP was, but not when you actually conceived. The point of the scan is to work out how many weeks pregnant you are. Ectopic pregnancy and miscarriage: diagnosis and initial management CG 154. You may have calculated the length of your pregnancy from the first day of your last menstrual period (LMP). If you prefer, you can have a private screening test.
The dating scan isn't designed to look for more subtle abnormalities, though.
It won't hurt, although you may feel a little pressure on your tummy.
If your womb (uterus) is very deep in your pelvis, or if you're overweight, you may be offered a vaginal scan, which can get a closer view of your baby.
The dating scan will also show if you're expecting twins, triplets, or more.
It's helpful to know about twins early on, and it's easier to see whether or not they share a placenta during the first trimester.