Conception dating scan
You may have calculated the length of your pregnancy from the first day of your last menstrual period (LMP).
This is even though you don't actually conceive until 14 days after your LMP, or later than this if your cycle is longer than 28 days.
This measures a collection of fluid under the skin at the back of a baby's neck.
This estimates the risk of Down syndrome and other chromosomal abnormalities. National Institute for Health and Clinical Excellence, clinical guideline 62. The doctor has asked to check for any bleeding and to stay positive. She was talking like that's what was definitely going to happen which has scared me and Iv been inconsolable!Having a scan in the first few months of pregnancy can be a thrilling experience.